# Unable to start ComfyUI v0.4.45

**URL:** <https://forum.comfy.org/t/unable-to-start-comfyui-v0-4-45/2496>\
**Category:** Custom Nodes\
**Created:** [May 4, 2025, 2:19pm UTC](https://forum.comfy.org/t/unable-to-start-comfyui-v0-4-45/2496 "2025-05-04T14:19:40Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![LFdA](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.comfy.org/lfda/32/628_2.png) [@LFdA](https://forum.comfy.org/u/LFdA)\
**Post date:** [May 4, 2025, 2:19pm UTC](https://forum.comfy.org/t/unable-to-start-comfyui-v0-4-45/2496/1 "2025-05-04T14:19:40Z")

</div>

Hello, I tried to install some custom nodes for a workflow by git cloning into the custom nodes folder. After that I started getting the following error.

Has anyone had a similar issue? I don’t know how to go about fixing this. Any help will be greatly appreciated.

[error] Failed to execute startup-script: /Users/…/Documents/ComfyUI/custom\_nodes/comfyui-manager/prestartup\_script.py / cannot import name ‘hdrs’ from partially initialized module ‘aiohttp’ (most likely due to a circular import) (/Users/…/Documents/ComfyUI/.venv/lib/python3.12/site-packages/aiohttp/ **init**.py)

[error] Failed to execute startup-script: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom\_nodes/ComfyUI-Manager/prestartup\_script.py / cannot import name ‘hdrs’ from partially initialized module ‘aiohttp’ (most likely due to a circular import) (/Users/…/Documents/ComfyUI/.venv/lib/python3.12/site-packages/aiohttp/ **init**.p

[info]  
Prestartup times for custom nodes:  
0.0 seconds (PRESTARTUP FAILED): /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom\_nodes/ComfyUI-Manager

[info] Total VRAM 16384 MB, total RAM 16384 MB  
pytorch version: 2.8.0.dev20250502

[info] Mac Version (14, 2, 1)

[error] Traceback (most recent call last):  
File “/Applications/ComfyUI.app/Contents/Resources/ComfyUI/main.py”, line 138, in

[error] import server  
File “/Applications/ComfyUI.app/Contents/Resources/ComfyUI/server.py”, line 21, in   
import aiohttp  
File “/Users/leoaguiar/Documents/ComfyUI/.venv/lib/python3.12/site-packages/aiohttp/ **init**.py”, line 5, in   
from . import hdrs as hdrs  
ImportError: cannot import name ‘hdrs’ from partially initialized module ‘aiohttp’ (most likely due to a circular import) (/Users/…/Documents/ComfyUI/.venv/lib/python3.12/site-packages/aiohttp/ **init**.py)