I got a "cannot import name '__version__' from 'pydantic_core' (unknown location)" error during ComfyUI bootup
14:31 11 Jul 2026

I got the following during bootup, with an Error 1.

I had just installed Textacy and Spacy, which may have triggered this. I scoured the web for a fix, but no luck.

I am relatively green when it comes to server stuff.

Process exited with code 1

...
  File "C:\Users\robf\ComfyUI-Installs\ComfyUI\ComfyUI\app\assets\api\routes.py", line 11, in 
    from pydantic import ValidationError
  File "C:\Users\robf\Documents\ComfyUI\.venv\Lib\site-packages\pydantic\__init__.py", line 5, in 
    from ._migration import getattr_migration
  File "C:\Users\robf\Documents\ComfyUI\.venv\Lib\site-packages\pydantic\_migration.py", line 4, in 
    from .version import version_short
  File "C:\Users\robf\Documents\ComfyUI\.venv\Lib\site-packages\pydantic\version.py", line 5, in 
    from pydantic_core import __version__ as __pydantic_core_version__
ImportError: cannot import name '__version__' from 'pydantic_core' (unknown location)
python pydantic