Error loading model: argument of type 'NoneType' is not iterable

[bichub1]

Getting error "Error loading model: argument of type 'NoneType' is not iterable"

[fpgaminer]

ComfyUI's console should have more information about what went wrong.

[bichub1]

[AuntIna]

@bichub1 It seems like this is due to an issue with the transformers.
This is what I had on a fresh Comfy installation, where I received exactly the same error.

>>> import transformers
>>> print(transformers.__version__)
4.52.4

I then manually downgraded to 4.51.3:

pip install --upgrade --force-reinstall transformers==4.51.3

And now it JoyCaption works - I am not sure if this broke anything else though, but it seems fine to me.