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[GH-ISSUE #789] No module named 'manager_core' #355

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opened 2026-10-27 21:16:37 +00:00 by bsakaguchi · 7 comments

bsakaguchi commented

2026-10-27 21:16:37 +00:00

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Originally created by @davedaverave on GitHub (Jun 18, 2024).
Original GitHub issue: https://github.com/Comfy-Org/ComfyUI-Manager/issues/789

I've got ComfyUI-Manager import failed, and read this error in console .... Cannot import /notebooks/ComfyUI/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_core'

My enviroment is in python 3.9 and can't get update, i don't know if that's causing the issue
Thanks

Originally created by @davedaverave on GitHub (Jun 18, 2024). Original GitHub issue: https://github.com/Comfy-Org/ComfyUI-Manager/issues/789 I've got ComfyUI-Manager import failed, and read this error in console .... Cannot import /notebooks/ComfyUI/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_core' My enviroment is in python 3.9 and can't get update, i don't know if that's causing the issue Thanks

bsakaguchi closed this issue

2026-10-27 21:16:38 +00:00

bsakaguchi commented

2026-10-27 21:16:38 +00:00

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@ltdrdata commented on GitHub (Jun 18, 2024):

It seems that your ComfyUI-Manager installation isn't valid.
Remove and reinstall it.

@ltdrdata commented on GitHub (Jun 18, 2024): It seems that your ComfyUI-Manager installation isn't valid. Remove and reinstall it.

bsakaguchi commented

2026-10-27 21:16:38 +00:00

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@gadams999 commented on GitHub (Jun 23, 2024):

I'm getting this also when attempting to install ComfyUI-Manager into stable diffusion webui docker. Is there a specific version of ComfyUI needed for Manager?

@gadams999 commented on GitHub (Jun 23, 2024): I'm getting this also when attempting to install ComfyUI-Manager into [stable diffusion webui docker](https://github.com/AbdBarho/stable-diffusion-webui-docker). Is there a specific version of ComfyUI needed for Manager?

bsakaguchi commented

2026-10-27 21:16:38 +00:00

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@ctxwing commented on GitHub (Jul 20, 2024):

i got just same as @gadams999 mentioned. i am installing ans setting just as "install ComfyUI-Manager into stable diffusion webui docker. Is there a specific version of ComfyUI needed for Manager?" got bumped same error. any solution or workaround ?

@ctxwing commented on GitHub (Jul 20, 2024): i got just same as @gadams999 mentioned. i am installing ans setting just as "install ComfyUI-Manager into [stable diffusion webui docker](https://github.com/AbdBarho/stable-diffusion-webui-docker). Is there a specific version of ComfyUI needed for Manager?" got bumped same error. any solution or workaround ?

bsakaguchi commented

2026-10-27 21:16:39 +00:00

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@ltdrdata commented on GitHub (Jul 20, 2024):

I'm getting this also when attempting to install ComfyUI-Manager into stable diffusion webui docker. Is there a specific version of ComfyUI needed for Manager?

Unless your ComfyUI is a very old version, this typically doesn't cause problems.
What command did you use to install ComfyUI-Manager?

@ltdrdata commented on GitHub (Jul 20, 2024): > I'm getting this also when attempting to install ComfyUI-Manager into [stable diffusion webui docker](https://github.com/AbdBarho/stable-diffusion-webui-docker). Is there a specific version of ComfyUI needed for Manager? Unless your ComfyUI is a very old version, this typically doesn't cause problems. What command did you use to install ComfyUI-Manager?

bsakaguchi commented

2026-10-27 21:16:39 +00:00

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@freeo commented on GitHub (Jul 21, 2024):

This issue was fixed for me by installing the python package spandrel.

This here was my initial error output, which doesn't mention it, the error was higher up in the startup log.

pytorch version: 2.1.1+cu121
xformers version: 0.0.23
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 4080 : cudaMallocAsync
Traceback (most recent call last):
  File "/mnt/S870P1/comfyui/nodes.py", line 1931, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/__init__.py", line 6, in <module>
    from .glob import manager_server
  File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/glob/manager_server.py", line 18, in <module>
    import manager_core as core
ModuleNotFoundError: No module named 'manager_core'

Cannot import /mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_cor
e'

@freeo commented on GitHub (Jul 21, 2024): This issue was fixed for me by installing the python package `spandrel`. This here was my initial error output, which doesn't mention it, the error was higher up in the startup log. ``` pytorch version: 2.1.1+cu121 xformers version: 0.0.23 Set vram state to: NORMAL_VRAM Device: cuda:0 NVIDIA GeForce RTX 4080 : cudaMallocAsync Traceback (most recent call last): File "/mnt/S870P1/comfyui/nodes.py", line 1931, in load_custom_node module_spec.loader.exec_module(module) File "<frozen importlib._bootstrap_external>", line 940, in exec_module File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/__init__.py", line 6, in <module> from .glob import manager_server File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/glob/manager_server.py", line 18, in <module> import manager_core as core ModuleNotFoundError: No module named 'manager_core' Cannot import /mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_cor e' ```

bsakaguchi commented

2026-10-27 21:16:39 +00:00

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@ltdrdata commented on GitHub (Jul 21, 2024):

This issue was fixed for me by installing the python package spandrel.

This here was my initial error output, which doesn't mention it, the error was higher up in the startup log.

pytorch version: 2.1.1+cu121
xformers version: 0.0.23
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 4080 : cudaMallocAsync
Traceback (most recent call last):
  File "/mnt/S870P1/comfyui/nodes.py", line 1931, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/__init__.py", line 6, in <module>
    from .glob import manager_server
  File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/glob/manager_server.py", line 18, in <module>
    import manager_core as core
ModuleNotFoundError: No module named 'manager_core'

Cannot import /mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_cor
e'

Because spandrel is a basic dependency package for ComfyUI, there should not be any issues if ComfyUI was installed or updated correctly.

I've learned about the situation where this error message occurs. Thanks

@ltdrdata commented on GitHub (Jul 21, 2024): > This issue was fixed for me by installing the python package `spandrel`. > > This here was my initial error output, which doesn't mention it, the error was higher up in the startup log. > > ``` > pytorch version: 2.1.1+cu121 > xformers version: 0.0.23 > Set vram state to: NORMAL_VRAM > Device: cuda:0 NVIDIA GeForce RTX 4080 : cudaMallocAsync > Traceback (most recent call last): > File "/mnt/S870P1/comfyui/nodes.py", line 1931, in load_custom_node > module_spec.loader.exec_module(module) > File "<frozen importlib._bootstrap_external>", line 940, in exec_module > File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed > File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/__init__.py", line 6, in <module> > from .glob import manager_server > File "/mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager/glob/manager_server.py", line 18, in <module> > import manager_core as core > ModuleNotFoundError: No module named 'manager_core' > > Cannot import /mnt/S870P1/comfyui/custom_nodes/ComfyUI-Manager module for custom nodes: No module named 'manager_cor > e' > ``` Because `spandrel` is a basic dependency package for ComfyUI, there should not be any issues if ComfyUI was installed or updated correctly. I've learned about the situation where this error message occurs. Thanks

bsakaguchi commented

2026-10-27 21:16:39 +00:00

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@pfmephisto commented on GitHub (Aug 19, 2024):

For me, the fix was changing the import to be relative.

diff --git a/glob/manager_server.py b/glob/manager_server.py
index e2f8989..ecfd8a0 100644
--- a/glob/manager_server.py
+++ b/glob/manager_server.py
@@ -13,7 +13,7 @@ import shutil
 import git
 
 from server import PromptServer
-import manager_core as core
+from . import manager_core as core
 import cm_global
 
 print(f"### Loading: ComfyUI-Manager ({core.version_str})")

@pfmephisto commented on GitHub (Aug 19, 2024): For me, the fix was changing the import to be relative. ``` diff --git a/glob/manager_server.py b/glob/manager_server.py index e2f8989..ecfd8a0 100644 --- a/glob/manager_server.py +++ b/glob/manager_server.py @@ -13,7 +13,7 @@ import shutil import git from server import PromptServer -import manager_core as core +from . import manager_core as core import cm_global print(f"### Loading: ComfyUI-Manager ({core.version_str})") ```

bsakaguchi referenced this issue

2026-10-27 21:29:43 +00:00

[PR #355] [MERGED] Add Comfyui-styles-all to custom node list #1287