[error] Python process exited with code 3221225477 and signal null

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Your question

Hello,
I try to use Wan 2.2 for the first time with ComfyUI, i installed ComfyUI app on my desktop, opened the template Wan 2.2 5B video generation, clic run with all default settings and get this error in the main.log file :
[error] Python process exited with code 3221225477 and signal null

The workflow seems good, takes a few minutes to get to 10% and then there is a red message in the top right corner sayin Reconnect and the wotkflow stops.

I have to say my computer is a Shadow PC, a virtual machine I pay for every month and might not have full controll on RAM but here are my setup:

System Information
OS
win32
Python Version
3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
Embedded Python
false
Pytorch Version
2.8.0+cu129
Arguments
C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Users\Shadow\Documents\ComfyUI\user --input-directory C:\Users\Shadow\Documents\ComfyUI\input --output-directory C:\Users\Shadow\Documents\ComfyUI\output --front-end-root C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\Shadow\Documents\ComfyUI --extra-model-paths-config C:\Users\Shadow\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000 --enable-manager --disable-cuda-malloc
RAM Total
15.98 GB
RAM Free
10.61 GB

Device
Name
cuda:0 NVIDIA RTX A4500 : native
Type
cuda
VRAM Total
18.74 GB
VRAM Free
17.61 GB
Torch VRAM Total
0 B
Torch VRAM Free
0 B

if anyone have a clue, thanks for helping

Logs

[2025-12-22 22:25:50.880] [info]  Using uv at C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\uv\win\uv.exe
[2025-12-22 22:25:50.881] [info]  Install state: installed
[2025-12-22 22:25:50.882] [info]  Validating installation. Recorded state: [installed]
[2025-12-22 22:25:50.887] [info]  Running uv command directly: pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt
[2025-12-22 22:25:50.887] [info]  Running uv child process: uv pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt
[2025-12-22 22:25:50.888] [info]  Running command: C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\uv\win\uv.exe pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt in C:\Users\Shadow\Documents\ComfyUI
[2025-12-22 22:25:51.751] [info]  Running uv command directly: pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\manager_requirements.txt
[2025-12-22 22:25:51.751] [info]  Running uv child process: uv pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\manager_requirements.txt
[2025-12-22 22:25:51.752] [info]  Running command: C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\uv\win\uv.exe pip install --dry-run -r C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\manager_requirements.txt in C:\Users\Shadow\Documents\ComfyUI
[2025-12-22 22:25:53.236] [info]  Validation result: isValid:true, state:installed {"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}
[2025-12-22 22:25:57.564] [info]  Server start
[2025-12-22 22:25:57.578] [info]  Running command: C:\Users\Shadow\Documents\ComfyUI\.venv\Scripts\python.exe C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Users\Shadow\Documents\ComfyUI\user --input-directory C:\Users\Shadow\Documents\ComfyUI\input --output-directory C:\Users\Shadow\Documents\ComfyUI\output --front-end-root C:\Users\Shadow\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\Shadow\Documents\ComfyUI --extra-model-paths-config C:\Users\Shadow\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000 --enable-manager --disable-cuda-malloc in C:\Users\Shadow\Documents\ComfyUI
[2025-12-22 22:25:57.652] [info]  Received renderer-ready message!
[2025-12-22 22:25:57.653] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.653] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.654] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.655] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.656] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.656] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.657] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.658] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.658] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.659] [info]  Sending queued message {"channel":"validation-update","data":{"inProgress":false,"installState":"installed","basePath":"OK","venvDirectory":"OK","pythonInterpreter":"OK","uv":"OK","pythonPackages":"OK","git":"OK","vcRedist":"OK"}}
[2025-12-22 22:25:57.659] [info]  Sending queued message {"channel":"loading-progress","data":{"status":"starting-server"}}
[2025-12-22 22:26:16.818] [info]  Python server is ready
[2025-12-22 22:26:27.561] [error] @todesktop/runtime: alwaysResolve: Promise timed out after 30000ms
[2025-12-22 22:41:22.788] [error] Python process exited with code 3221225477 and signal null

Other

No response

---

This issue is transferred from: comfyanonymous/ComfyUI#11472

Original issue was created by @dinozob88 at 2025-12-22T22:15:02.000Z

┆Issue is synchronized with this Notion page by Unito

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👤 Suggested Assignees

• lucasye2008
• Amirhesam1122

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