Unable to parse pyproject.toml due to lack dependency pydantic-settings

[wmdk200086]

Custom Node Testing

• I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)

Your question

Unable to parse pyproject.toml due to lack dependency pydantic-settings, please run 'pip install -r requirements.txt': 1 validation error for PyProjectLoader
build-system
Extra inputs are not permitted [type=extra_forbidden, input_value={'requires': ['hatchling'...end': 'hatchling.build'}, input_type=dict]
For further information visit https://errors.pydantic.dev/2.11/v/extra_forbidden

Logs

Other

No response

[ltdrdata]

Please upload the full log.

[patientx]

In my case, even after reinstalling the requirements.txt and making sure both pydantic (2.11.5) and pydantic-settings (2.9.1) are installed this error still pops up...

EDIT : Found the culprit. The error is occurring because ComfyUI is trying to parse a pyproject.toml file somewhere in your installation, and that file has a structure that doesn't match what the Pydantic model expects. In my case it was ComfyMath and the structure that doesn't work was this :

Unable to parse pyproject.toml due to lack dependency pydantic-settings, please run 'pip install -r requirements.txt': 1 validation error for PyProjectLoader
build-system
Extra inputs are not permitted [type=extra_forbidden, input_value={'requires': ['poetry-cor...oetry.core.masonry.api'}, input_type=dict]
For further information visit https://errors.pydantic.dev/2.11/v/extra_forbidden

Two options, either remove the node , wait for them to update for a fix, or delete the build part from pyproject.toml, this worked. Node is still working this way. It could be any node, comfy doesn't specific the exact one so you have to check all pyproject.toml's in custom_nodes.

[HyperTwo]

same problem, but i did not meet this error yesterday

[jtydhr88]

please double check after #8526 merged

[jtydhr88]

I think this issue can be closed

[Tan1F913]

Hi, I'm still having this issue:
`## ComfyUI-Manager: installing dependencies done.
** ComfyUI startup time: 2025-10-31 14:00:20.531
** Platform: Windows
** Python version: 3.10.11 (tags/v3.10.11:7d4cc5a, Apr 5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]
** Python executable: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\venv\Scripts\python.exe
** ComfyUI Path: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI
** ComfyUI Base Folder Path: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI
** User directory: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\user
** ComfyUI-Manager config path: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\user\default\ComfyUI-Manager\config.ini
** Log path: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\user\comfyui.log

Prestartup times for custom nodes:
1.3 seconds: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\custom_nodes\ComfyUI-Manager

Checkpoint files will always be loaded safely.
Total VRAM 32607 MB, total RAM 64629 MB
pytorch version: 2.8.0+cu129
Set vram state to: HIGH_VRAM
Device: cuda:0 NVIDIA GeForce RTX 5090 : cudaMallocAsync
Using pytorch attention
Python version: 3.10.11 (tags/v3.10.11:7d4cc5a, Apr 5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]
ComfyUI version: 0.3.64
ComfyUI frontend version: 1.27.10
[Prompt Server] web root: C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\venv\lib\site-packages\comfyui_frontend_package\static
Unable to parse pyproject.toml due to lack dependency pydantic-settings, please run 'pip install -r requirements.txt': cannot import name 'Sentinel' from 'typing_extensions' (C:\Program Files\StabilityMatrix-win-x64\Data\Packages\ComfyUI\venv\lib\site-packages\typing_extensions.py)
`
I even tried to change the "config_parpser.py" and "types.py" without noticing improvement.
Any thoughts?

[Tan1F913]

Fixed, just updated to ComfyUI 0.3.66!
Still few other issues, will investigate later.

[tounsicorp]

Extremely annoying. fresh install. As soon as Comfyui manager installed. Constantly get this error. Refreshed install. Continuously get this error now. Comfyui breaks itself after each update.