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[GH-ISSUE #1362] [Bug]: LTXV workflow cannot work after updated ComfyUI desktop(MacOS) v0.5.0 (core v0.3.63) #380

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opened 2026-10-31 22:12:19 +00:00 by bsakaguchi · 4 comments
bsakaguchi commented 2026-10-31 22:12:19 +00:00
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Originally created by @lucasye2008 on GitHub (Oct 7, 2025).
Original GitHub issue: https://github.com/Comfy-Org/desktop/issues/1362

App Version

ComfyUI desktop(MacOS) v0.5.0 (core v0.3.63)

Expected Behavior

LTXV workflow worked well until updated ComfyUI desktop(MacOS) v0.4.76 (core v0.3.62)

Actual Behavior

Error Info:

LTXVBaseSampler 'LTXVPreprocess' object has no attribute 'preprocess'

Image

Steps to Reproduce

Tried to disabled other custom nodes, and reinstalled the Ltxv nodes from Comfyui Manager.
Restarted Comfyui. Run the workflow.

ltxv-13b-dist-i2v-base-2.json

Debug Logs

[rgthree-comfy] Loaded 48 epic nodes. 🎉

### Loading: ComfyUI-Impact-Pack (V8.23)
[Impact Pack] Wildcards loading done.
### Loading: ComfyUI-Impact-Subpack (V1.3.5)
[Impact Pack/Subpack] Using folder_paths to determine whitelist path: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt
[Impact Pack/Subpack] Ensured whitelist directory exists: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack
[Impact Pack/Subpack] Loaded 0 model(s) from whitelist: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt
[Impact Subpack] ultralytics_bbox: /Volumes/ORICO_Media/Comfy/models/ultralytics/bbox
[Impact Subpack] ultralytics_segm: /Volumes/ORICO_Media/Comfy/models/ultralytics/segm
[Impact Subpack] ultralytics_bbox: /Volumes/ORICO_Media/Comfy/models/ultralytics/bbox
[Impact Subpack] ultralytics_segm: /Volumes/ORICO_Media/Comfy/models/ultralytics/segm
[ComfyUI-Easy-Use] server: v1.3.3 Loaded
[ComfyUI-Easy-Use] web root: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-easy-use/web_version/v2 Loaded
[/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using ckpts path: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux/ckpts
[/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using symlinks: False
[/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using ort providers: ['CUDAExecutionProvider', 'DirectMLExecutionProvider', 'OpenVINOExecutionProvider', 'ROCMExecutionProvider', 'CPUExecutionProvider', 'CoreMLExecutionProvider']
DWPose: Onnxruntime with acceleration providers detected
📊 Initial MPS memory: 52.12GB free / 64.00GB total

[ReActor] - STATUS - Running v0.6.2-a4 in ComfyUI
Torch version: 2.8.0
Please 'pip install xformers'
Nvidia APEX normalization not installed, using PyTorch LayerNorm
[Jimeng Image 4.0] 火山引擎SDK未找到
[Jimeng Image 4.0] 请将volcengine包放入 lib/ 目录，或运行: pip install volcengine
[WBLESS] Applied execution hook for new ComfyUI version (for InversedSwitch blocking)
2025-10-07 17:08:35.845 | INFO     | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded
2025-10-07 17:08:35.845 | INFO     | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded
2025-10-07 17:08:35.847 | INFO     | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded
2025-10-07 17:08:35.847 | INFO     | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded
Failed to find comfy root automatically, please copy the folder /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyLiterals/web manually in the web/extensions folder of ComfyUI
[IndexTTS] 使用transformers新版API (>= 4.49)，LogitsProcessor
('Looking for cached Spacy xx_sent_ud_sm.',)

### [START] ComfyUI AlekPet Nodes v1.0.88 ###
Node -> ChatGLMNode: ChatGLM4TranslateCLIPTextEncodeNode, ChatGLM4TranslateTextNode, ChatGLM4InstructNode, ChatGLM4InstructMediaNode [Loading]
Node -> PainterNode: PainterNode [Loading]
Node -> IDENode: IDENode [Loading]
Node -> PoseNode: PoseNode [Loading]
Node -> GoogleTranslateNode: GoogleTranslateCLIPTextEncodeNode, GoogleTranslateTextNode [Loading]
Node -> DeepTranslatorNode: DeepTranslatorCLIPTextEncodeNode, DeepTranslatorTextNode [Loading]
Node -> ArgosTranslateNode: ArgosTranslateCLIPTextEncodeNode, ArgosTranslateTextNode [Loading]
Node -> ExtrasNode: PreviewTextNode, HexToHueNode, ColorsCorrectNode [Loading]
### [END] ComfyUI AlekPet Nodes ###
[tinyterraNodes] Loaded
no module 'xformers'. Processing without...
no module 'xformers'. Processing without...
WAS Node Suite: OpenCV Python FFMPEG support is enabled
WAS Node Suite Warning: `ffmpeg_bin_path` is not set in `/Volumes/ORICO_Media/Comfy/custom_nodes/was-ns/was_suite_config.json` config file. Will attempt to use system ffmpeg binaries if available.
WAS Node Suite: Finished. Loaded 220 nodes successfully.

        "Art is the journey of a free soul." - Alev Oguz

### Loading: ComfyUI-Manager (V3.36)
[ComfyUI-Manager] network_mode: public
### ComfyUI Revision: UNKNOWN (The currently installed ComfyUI is not a Git repository)

Import times for custom nodes:
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfy-image-saver
   0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/websocket_image_save.py
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyLiterals
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI_JPS-Nodes
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Image-Filters
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_instantid
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-wd14-tagger
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_ipadapter_plus
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Easy-IndexTTS2
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_essentials
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-custom-scripts
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-videohelpersuite
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-segment-anything-2
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_ultimatesdupscale
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-kjnodes
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/rgthree-comfy
   0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI_LayerStyle_Advance
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_tinyterranodes
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-InstantID
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-WBLESS
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-impact-subpack
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-SeedVR2_VideoUpscaler
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-impact-pack
   0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-WanVideoWrapper
   0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_layerstyle
   0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Index-TTS
   0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/teacache
   0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-easy-use
   0.2 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-supir
   0.3 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/was-ns
   0.6 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_pulid_flux_ll
   0.6 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-reactor
   0.8 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes
   1.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_custom_nodes_alekpet
   1.7 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-rmbg

Failed to initialize database. Please ensure you have installed the latest requirements. If the error persists, please report this as in future the database will be required: (sqlite3.OperationalError) unable to open database file
(Background on this error at: https://sqlalche.me/e/20/e3q8)
Starting server

To see the GUI go to: http://127.0.0.1:8000
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/alter-list.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/model-list.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/github-stats.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/extension-node-map.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json
comfyui-frontend-package not found in requirements.txt
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/photoswipe-lightbox.esm.min.js
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/pickr.min.js
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/photoswipe.min.css
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/classic.min.css
[TimbreAudioLoader] 已加载 64 个音频文件
[TimbreAudioLoader] 已加载 64 个音频文件
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/juxtapose.css
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/model-viewer.min.js
comfyui-frontend-package not found in requirements.txt
/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/juxtapose.min.js
[TimbreAudioLoader] 已加载 64 个音频文件
[TimbreAudioLoader] 已加载 64 个音频文件
FETCH ComfyRegistry Data: 5/99
got prompt
model weight dtype torch.bfloat16, manual cast: None
model_type FLUX
FETCH ComfyRegistry Data: 10/99
VAE load device: mps, offload device: cpu, dtype: torch.bfloat16
no CLIP/text encoder weights in checkpoint, the text encoder model will not be loaded.
loaded diffusion model directly to GPU
Requested to load LTXV
loaded completely 9.5367431640625e+25 24874.461181640625 True
Requested to load MochiTEModel_
loaded completely 9.5367431640625e+25 9083.38671875 True
CLIP/text encoder model load device: cpu, offload device: cpu, current: cpu, dtype: torch.float16
FETCH ComfyRegistry Data: 15/99
Using preset:  None
Skip steps sigma threshold:  0.9970000000000002
Cfg star rescale:  True
Sigma list:  [1.0, 0.9933, 0.985, 0.9767, 0.9008, 0.618]
Cfg list:  [1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
Stg scale list:  [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Stg rescale list:  [1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
Stg layers indices list:  [[35], [35], [35], [42], [42], [42]]
!!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess'
Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample
    optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess(
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess'

Prompt executed in 29.17 seconds
FETCH ComfyRegistry Data: 20/99
FETCH ComfyRegistry Data: 25/99
FETCH ComfyRegistry Data: 30/99
FETCH ComfyRegistry Data: 35/99
FETCH ComfyRegistry Data: 40/99
FETCH ComfyRegistry Data: 45/99
FETCH ComfyRegistry Data: 50/99
FETCH ComfyRegistry Data: 55/99
FETCH ComfyRegistry Data: 60/99
FETCH ComfyRegistry Data: 65/99
FETCH ComfyRegistry Data: 70/99
FETCH ComfyRegistry Data: 75/99
FETCH ComfyRegistry Data: 80/99
FETCH ComfyRegistry Data: 85/99
FETCH ComfyRegistry Data: 90/99
FETCH ComfyRegistry Data: 95/99
FETCH ComfyRegistry Data [DONE]
[ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
FETCH DATA from: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json [DONE]
[ComfyUI-Manager] All startup tasks have been completed.
got prompt
Failed to validate prompt for output 1336:
* CheckpointLoaderSimple 44:
  - Value not in list: ckpt_name: 'ltxv-13b-0.9.7-distilled.safetensors' not in ['Ltxv/ltxv-13b-0.9.8-distilled.safetensors', 'SD1.5/SD1.5_cyberrealistic_v9.safetensors', 'SD1.5/SD1.5_majicmixRealistic_v7.safetensors', 'SDXL/SDXL_梦碎XL真实感大模型_NeverDream_FUSION-V1.safetensors', 'SDXL/cyberrealisticPony_v130.safetensors', 'SDXL/cyberrealisticXL_v70.safetensors', 'SDXL/iniverseMixSFWNSFW_ponyRealGuofengV51.safetensors', 'SDXL/ponyRealism_V23ULTRA.safetensors', 'SDXL/realDream_sdxlPony20.safetensors', 'SDXL/sd_xl_base_1.0.safetensors', 'SUPIR/SUPIR-v0Q.ckpt']
Output will be ignored
Failed to validate prompt for output 1599:
Output will be ignored
invalid prompt: {'type': 'prompt_outputs_failed_validation', 'message': 'Prompt outputs failed validation', 'details': '', 'extra_info': {}}
got prompt
Using preset:  None
Skip steps sigma threshold:  0.9970000000000002
Cfg star rescale:  True
Sigma list:  [1.0, 0.9933, 0.985, 0.9767, 0.9008, 0.618]
Cfg list:  [1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
Stg scale list:  [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Stg rescale list:  [1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
Stg layers indices list:  [[25], [35], [35], [42], [42], [42]]
!!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess'
Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample
    optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess(
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess'

Prompt executed in 1.27 seconds
got prompt
!!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess'
Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample
    optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess(
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess'

Prompt executed in 0.01 seconds
got prompt
!!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess'
Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample
    optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess(
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess'

Prompt executed in 0.01 seconds

Browser Logs

127.0.0.1-1759853789858.log

Settings JSON

main.log
comfyui.log
main.log_2025-10-07T16-10-46-371Z.log

Other

No response

┆Issue is synchronized with this Notion page by Unito

Originally created by @lucasye2008 on GitHub (Oct 7, 2025). Original GitHub issue: https://github.com/Comfy-Org/desktop/issues/1362 ### App Version ComfyUI desktop(MacOS) v0.5.0 (core v0.3.63) ### Expected Behavior LTXV workflow worked well until updated ComfyUI desktop(MacOS) v0.4.76 (core v0.3.62) ### Actual Behavior Error Info:
 LTXVBaseSampler 'LTXVPreprocess' object has no attribute 'preprocess' <img width="3018" height="1598" alt="Image" src="https://github.com/user-attachments/assets/9fff061b-ed2b-4fc4-9ec4-dc702ea09e0e" /> ### Steps to Reproduce Tried to disabled other custom nodes, and reinstalled the Ltxv nodes from Comfyui Manager.
Restarted Comfyui. Run the workflow. [ltxv-13b-dist-i2v-base-2.json](https://github.com/user-attachments/files/22749451/ltxv-13b-dist-i2v-base-2.json) ### Debug Logs ```powershell [rgthree-comfy] Loaded 48 epic nodes. 🎉 ### Loading: ComfyUI-Impact-Pack (V8.23) [Impact Pack] Wildcards loading done. ### Loading: ComfyUI-Impact-Subpack (V1.3.5) [Impact Pack/Subpack] Using folder_paths to determine whitelist path: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt [Impact Pack/Subpack] Ensured whitelist directory exists: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack [Impact Pack/Subpack] Loaded 0 model(s) from whitelist: /Volumes/ORICO_Media/Comfy/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt [Impact Subpack] ultralytics_bbox: /Volumes/ORICO_Media/Comfy/models/ultralytics/bbox [Impact Subpack] ultralytics_segm: /Volumes/ORICO_Media/Comfy/models/ultralytics/segm [Impact Subpack] ultralytics_bbox: /Volumes/ORICO_Media/Comfy/models/ultralytics/bbox [Impact Subpack] ultralytics_segm: /Volumes/ORICO_Media/Comfy/models/ultralytics/segm [ComfyUI-Easy-Use] server: v1.3.3 Loaded [ComfyUI-Easy-Use] web root: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-easy-use/web_version/v2 Loaded [/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using ckpts path: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux/ckpts [/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using symlinks: False [/Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux] | INFO -> Using ort providers: ['CUDAExecutionProvider', 'DirectMLExecutionProvider', 'OpenVINOExecutionProvider', 'ROCMExecutionProvider', 'CPUExecutionProvider', 'CoreMLExecutionProvider'] DWPose: Onnxruntime with acceleration providers detected 📊 Initial MPS memory: 52.12GB free / 64.00GB total [ReActor] - STATUS - Running v0.6.2-a4 in ComfyUI Torch version: 2.8.0 Please 'pip install xformers' Nvidia APEX normalization not installed, using PyTorch LayerNorm [Jimeng Image 4.0] 火山引擎SDK未找到 [Jimeng Image 4.0] 请将volcengine包放入 lib/ 目录，或运行: pip install volcengine [WBLESS] Applied execution hook for new ComfyUI version (for InversedSwitch blocking) 2025-10-07 17:08:35.845 | INFO | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded 2025-10-07 17:08:35.845 | INFO | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded 2025-10-07 17:08:35.847 | INFO | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded 2025-10-07 17:08:35.847 | INFO | cozy_comfyui.node:loader:135 - WBLESS 17 nodes loaded Failed to find comfy root automatically, please copy the folder /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyLiterals/web manually in the web/extensions folder of ComfyUI [IndexTTS] 使用transformers新版API (>= 4.49)，LogitsProcessor ('Looking for cached Spacy xx_sent_ud_sm.',) ### [START] ComfyUI AlekPet Nodes v1.0.88 ### Node -> ChatGLMNode: ChatGLM4TranslateCLIPTextEncodeNode, ChatGLM4TranslateTextNode, ChatGLM4InstructNode, ChatGLM4InstructMediaNode [Loading] Node -> PainterNode: PainterNode [Loading] Node -> IDENode: IDENode [Loading] Node -> PoseNode: PoseNode [Loading] Node -> GoogleTranslateNode: GoogleTranslateCLIPTextEncodeNode, GoogleTranslateTextNode [Loading] Node -> DeepTranslatorNode: DeepTranslatorCLIPTextEncodeNode, DeepTranslatorTextNode [Loading] Node -> ArgosTranslateNode: ArgosTranslateCLIPTextEncodeNode, ArgosTranslateTextNode [Loading] Node -> ExtrasNode: PreviewTextNode, HexToHueNode, ColorsCorrectNode [Loading] ### [END] ComfyUI AlekPet Nodes ### [tinyterraNodes] Loaded no module 'xformers'. Processing without... no module 'xformers'. Processing without... WAS Node Suite: OpenCV Python FFMPEG support is enabled WAS Node Suite Warning: `ffmpeg_bin_path` is not set in `/Volumes/ORICO_Media/Comfy/custom_nodes/was-ns/was_suite_config.json` config file. Will attempt to use system ffmpeg binaries if available. WAS Node Suite: Finished. Loaded 220 nodes successfully. "Art is the journey of a free soul." - Alev Oguz ### Loading: ComfyUI-Manager (V3.36) [ComfyUI-Manager] network_mode: public ### ComfyUI Revision: UNKNOWN (The currently installed ComfyUI is not a Git repository) Import times for custom nodes: 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfy-image-saver 0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/websocket_image_save.py 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyLiterals 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI_JPS-Nodes 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Image-Filters 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_instantid 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-wd14-tagger 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_ipadapter_plus 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Easy-IndexTTS2 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_essentials 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-custom-scripts 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-videohelpersuite 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-segment-anything-2 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_ultimatesdupscale 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-kjnodes 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/rgthree-comfy 0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_controlnet_aux 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI_LayerStyle_Advance 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_tinyterranodes 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-InstantID 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-WBLESS 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-impact-subpack 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-SeedVR2_VideoUpscaler 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-impact-pack 0.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-WanVideoWrapper 0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_layerstyle 0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-Index-TTS 0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/teacache 0.1 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-easy-use 0.2 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-supir 0.3 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/was-ns 0.6 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_pulid_flux_ll 0.6 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-reactor 0.8 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes 1.0 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui_custom_nodes_alekpet 1.7 seconds: /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-rmbg Failed to initialize database. Please ensure you have installed the latest requirements. If the error persists, please report this as in future the database will be required: (sqlite3.OperationalError) unable to open database file (Background on this error at: https://sqlalche.me/e/20/e3q8) Starting server To see the GUI go to: http://127.0.0.1:8000 [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/alter-list.json [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/model-list.json [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/github-stats.json [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/extension-node-map.json [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json comfyui-frontend-package not found in requirements.txt /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/photoswipe-lightbox.esm.min.js /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/pickr.min.js /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/photoswipe.min.css /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/classic.min.css [TimbreAudioLoader] 已加载 64 个音频文件 [TimbreAudioLoader] 已加载 64 个音频文件 /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/juxtapose.css /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/model-viewer.min.js comfyui-frontend-package not found in requirements.txt /Volumes/ORICO_Media/Comfy/custom_nodes/comfyui-mixlab-nodes/webApp/lib/juxtapose.min.js [TimbreAudioLoader] 已加载 64 个音频文件 [TimbreAudioLoader] 已加载 64 个音频文件 FETCH ComfyRegistry Data: 5/99 got prompt model weight dtype torch.bfloat16, manual cast: None model_type FLUX FETCH ComfyRegistry Data: 10/99 VAE load device: mps, offload device: cpu, dtype: torch.bfloat16 no CLIP/text encoder weights in checkpoint, the text encoder model will not be loaded. loaded diffusion model directly to GPU Requested to load LTXV loaded completely 9.5367431640625e+25 24874.461181640625 True Requested to load MochiTEModel_ loaded completely 9.5367431640625e+25 9083.38671875 True CLIP/text encoder model load device: cpu, offload device: cpu, current: cpu, dtype: torch.float16 FETCH ComfyRegistry Data: 15/99 Using preset: None Skip steps sigma threshold: 0.9970000000000002 Cfg star rescale: True Sigma list: [1.0, 0.9933, 0.985, 0.9767, 0.9008, 0.618] Cfg list: [1.0, 1.0, 1.0, 1.0, 1.0, 1.0] Stg scale list: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Stg rescale list: [1.0, 1.0, 1.0, 1.0, 1.0, 1.0] Stg layers indices list: [[35], [35], [35], [42], [42], [42]] !!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess' Traceback (most recent call last): File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list await process_inputs(input_dict, i) File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs result = f(**inputs) ^^^^^^^^^^^ File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess' Prompt executed in 29.17 seconds FETCH ComfyRegistry Data: 20/99 FETCH ComfyRegistry Data: 25/99 FETCH ComfyRegistry Data: 30/99 FETCH ComfyRegistry Data: 35/99 FETCH ComfyRegistry Data: 40/99 FETCH ComfyRegistry Data: 45/99 FETCH ComfyRegistry Data: 50/99 FETCH ComfyRegistry Data: 55/99 FETCH ComfyRegistry Data: 60/99 FETCH ComfyRegistry Data: 65/99 FETCH ComfyRegistry Data: 70/99 FETCH ComfyRegistry Data: 75/99 FETCH ComfyRegistry Data: 80/99 FETCH ComfyRegistry Data: 85/99 FETCH ComfyRegistry Data: 90/99 FETCH ComfyRegistry Data: 95/99 FETCH ComfyRegistry Data [DONE] [ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes FETCH DATA from: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json [DONE] [ComfyUI-Manager] All startup tasks have been completed. got prompt Failed to validate prompt for output 1336: * CheckpointLoaderSimple 44: - Value not in list: ckpt_name: 'ltxv-13b-0.9.7-distilled.safetensors' not in ['Ltxv/ltxv-13b-0.9.8-distilled.safetensors', 'SD1.5/SD1.5_cyberrealistic_v9.safetensors', 'SD1.5/SD1.5_majicmixRealistic_v7.safetensors', 'SDXL/SDXL_梦碎XL真实感大模型_NeverDream_FUSION-V1.safetensors', 'SDXL/cyberrealisticPony_v130.safetensors', 'SDXL/cyberrealisticXL_v70.safetensors', 'SDXL/iniverseMixSFWNSFW_ponyRealGuofengV51.safetensors', 'SDXL/ponyRealism_V23ULTRA.safetensors', 'SDXL/realDream_sdxlPony20.safetensors', 'SDXL/sd_xl_base_1.0.safetensors', 'SUPIR/SUPIR-v0Q.ckpt'] Output will be ignored Failed to validate prompt for output 1599: Output will be ignored invalid prompt: {'type': 'prompt_outputs_failed_validation', 'message': 'Prompt outputs failed validation', 'details': '', 'extra_info': {}} got prompt Using preset: None Skip steps sigma threshold: 0.9970000000000002 Cfg star rescale: True Sigma list: [1.0, 0.9933, 0.985, 0.9767, 0.9008, 0.618] Cfg list: [1.0, 1.0, 1.0, 1.0, 1.0, 1.0] Stg scale list: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Stg rescale list: [1.0, 1.0, 1.0, 1.0, 1.0, 1.0] Stg layers indices list: [[25], [35], [35], [42], [42], [42]] !!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess' Traceback (most recent call last): File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list await process_inputs(input_dict, i) File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs result = f(**inputs) ^^^^^^^^^^^ File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess' Prompt executed in 1.27 seconds got prompt !!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess' Traceback (most recent call last): File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list await process_inputs(input_dict, i) File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs result = f(**inputs) ^^^^^^^^^^^ File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess' Prompt executed in 0.01 seconds got prompt !!! Exception during processing !!! 'LTXVPreprocess' object has no attribute 'preprocess' Traceback (most recent call last): File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 496, in execute output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 315, in get_output_data return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 289, in _async_map_node_over_list await process_inputs(input_dict, i) File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/execution.py", line 277, in process_inputs result = f(**inputs) ^^^^^^^^^^^ File "/Volumes/ORICO_Media/Comfy/custom_nodes/ComfyUI-LTXVideo/easy_samplers.py", line 146, in sample optional_cond_images = comfy_extras.nodes_lt.LTXVPreprocess().preprocess( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'LTXVPreprocess' object has no attribute 'preprocess' Prompt executed in 0.01 seconds ``` ### Browser Logs [127.0.0.1-1759853789858.log](https://github.com/user-attachments/files/22749574/127.0.0.1-1759853789858.log) ### Settings JSON [main.log](https://github.com/user-attachments/files/22749607/main.log) [comfyui.log](https://github.com/user-attachments/files/22749608/comfyui.log) [main.log_2025-10-07T16-10-46-371Z.log](https://github.com/user-attachments/files/22749606/main.log_2025-10-07T16-10-46-371Z.log) ### Other _No response_ ┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-1362-Bug-LTXV-workflow-cannot-work-after-updated-ComfyUI-desktop-MacOS-v0-5-0-core-v0--2856d73d3650816f9f2beb93cbb6e90c) by [Unito](https://www.unito.io)
bsakaguchi 2026-10-31 22:12:19 +00:00
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bsakaguchi commented 2026-10-31 22:12:20 +00:00
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@dosubot[bot] commented on GitHub (Oct 7, 2025):

The error 'LTXVPreprocess' object has no attribute 'preprocess' is not caused by the ComfyUI desktop app itself, but by the LTXV custom node (ComfyUI-LTXVideo) or its compatibility with the updated ComfyUI core. The desktop app only manages launching and setup; it does not implement or change Python backend node APIs like LTXVPreprocess—any missing attribute errors originate in the custom node or backend, not the desktop wrapper.

There are no migration notes, release notes, or support threads in the desktop repo or official docs that mention this error or breaking changes affecting LTXV after the update. The most likely cause is that the LTXV node version you have is not compatible with the new ComfyUI core, or the preprocess method was removed, renamed, or refactored in a recent LTXV update.

The recommended next steps are: check the LTXV node's own repository for recent changes to the LTXVPreprocess class, especially regarding the preprocess method; review its release notes or issues for compatibility guidance with ComfyUI core v0.3.63; and if you don't find public guidance, reach out to the LTXV node maintainer with your error details and environment info. This is a node-specific implementation issue, not a desktop app bug.

For general troubleshooting, updating or reinstalling the LTXV node via ComfyUI Manager sometimes resolves these issues if a compatible version is available. If not, you may need to wait for an update from the node author or consider reverting to the previous working version of ComfyUI desktop if your workflow depends on LTXV.

Reference: ComfyUI custom node troubleshooting guide

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<!-- gh-comment-id:3377642255 --> @dosubot[bot] commented on GitHub (Oct 7, 2025): <!-- Answer --> The error `'LTXVPreprocess' object has no attribute 'preprocess'` is not caused by the ComfyUI desktop app itself, but by the LTXV custom node (ComfyUI-LTXVideo) or its compatibility with the updated ComfyUI core. The desktop app only manages launching and setup; it does not implement or change Python backend node APIs like `LTXVPreprocess`—any missing attribute errors originate in the custom node or backend, not the desktop wrapper. There are no migration notes, release notes, or support threads in the desktop repo or official docs that mention this error or breaking changes affecting LTXV after the update. The most likely cause is that the LTXV node version you have is not compatible with the new ComfyUI core, or the `preprocess` method was removed, renamed, or refactored in a recent LTXV update. The recommended next steps are: check the LTXV node's own repository for recent changes to the `LTXVPreprocess` class, especially regarding the `preprocess` method; review its release notes or issues for compatibility guidance with ComfyUI core v0.3.63; and if you don't find public guidance, reach out to the LTXV node maintainer with your error details and environment info. This is a node-specific implementation issue, not a desktop app bug. For general troubleshooting, updating or reinstalling the LTXV node via ComfyUI Manager sometimes resolves these issues if a compatible version is available. If not, you may need to wait for an update from the node author or consider reverting to the previous working version of ComfyUI desktop if your workflow depends on LTXV. Reference: [ComfyUI custom node troubleshooting guide](https://docs.comfy.org/troubleshooting/custom-node-issues) <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=Comfy-Org%2Fdesktop).* --- Share context across your team and agents. Try [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-tagline&utm_term=Comfy-Org%2Fdesktop). 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bsakaguchi commented 2026-10-31 22:12:20 +00:00
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@lucasye2008 commented on GitHub (Oct 8, 2025):

Thanks. How to revert to the previous working version of ComfyUI desktop?

<!-- gh-comment-id:3379223384 --> @lucasye2008 commented on GitHub (Oct 8, 2025): Thanks. How to revert to the previous working version of ComfyUI desktop?
bsakaguchi commented 2026-10-31 22:12:20 +00:00
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@dosubot[bot] commented on GitHub (Oct 8, 2025):

To revert to a previous version of ComfyUI Desktop on macOS, uninstall the current app by deleting ComfyUI from your Applications folder. If you want a clean slate, also remove ~/Library/Application Support/ComfyUI to clear user data and settings docs.

Next, download the installer for the older version you want (such as v0.4.76) from the GitHub Releases page or any archived installer link you have. The official download link always points to the latest release, so for older versions, use the Releases page.

Install the older version by dragging the app into your Applications folder. During setup, you can migrate your user files and custom nodes, but you may need to manually reinstall or update custom nodes if they don’t work as expected after downgrading docs.

If you have a backup of your previous installation directory, restoring it will also revert your app, settings, and custom nodes thread.

For more details, see the ComfyUI Desktop User Guide.

To reply, just mention @dosu.

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<!-- gh-comment-id:3379227078 --> @dosubot[bot] commented on GitHub (Oct 8, 2025): <!-- Answer --> To revert to a previous version of ComfyUI Desktop on macOS, uninstall the current app by deleting ComfyUI from your Applications folder. If you want a clean slate, also remove `~/Library/Application Support/ComfyUI` to clear user data and settings [docs](https://docs.comfy.org/installation/desktop/macos). Next, download the installer for the older version you want (such as v0.4.76) from the [GitHub Releases page](https://github.com/Comfy-Org/desktop/releases) or any archived installer link you have. The official download link always points to the latest release, so for older versions, use the Releases page. Install the older version by dragging the app into your Applications folder. During setup, you can migrate your user files and custom nodes, but you may need to manually reinstall or update custom nodes if they don’t work as expected after downgrading [docs](https://docs.comfy.org/installation/desktop/macos). If you have a backup of your previous installation directory, restoring it will also revert your app, settings, and custom nodes [thread](https://github.com/Comfy-Org/desktop/issues/687#issuecomment-2604615427). For more details, see the [ComfyUI Desktop User Guide](https://comfyorg.notion.site/ComfyUI-Desktop-User-Guide-1146d73d365080a49058e8d629772f0a). <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=Comfy-Org%2Fdesktop).* --- Docs are dead. Just use [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-tagline&utm_term=Comfy-Org%2Fdesktop). 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bsakaguchi commented 2026-10-31 22:12:20 +00:00
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@lucasye2008 commented on GitHub (Oct 8, 2025):

v0.5.1(core v.0.3.64) fixed the issue. Thanks a ton for the prompt fix.

<!-- gh-comment-id:3381662799 --> @lucasye2008 commented on GitHub (Oct 8, 2025): v0.5.1(core v.0.3.64) fixed the issue. Thanks a ton for the prompt fix.
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area: desktop-app
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component: installer
component: preload
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installation
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platform: cross-platform
platform: windows
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stale
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Reference
Comfy-Org/desktop#380
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