Since a week ago aprarently our docs are failing with the following message:
```
File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/site-packages/jax/_src/dispatch.py",
line 58, in <module> from etils import epath File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/site-packages/etils/epath/__init__.py",
line 23, in <module> from etils.epath.resource_utils import resource_path
File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/site-packages/etils/epath/resource_utils.py",
line 34, in <module> import importlib_resources File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/site-packages/importlib_resources/__init__.py",
line 3, in <module> from ._common import ( File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/site-packages/importlib_resources/_common.py",
line 86, in <module> def _(cand: None) -> types.ModuleType: File
"/home/docs/checkouts/readthedocs.org/user_builds/kfac-jax/envs/latest/lib/python3.7/functools.py",
line 827, in register f"Invalid annotation for {argname!r}. {cls!r} is not
a class." AssertionError: Invalid annotation for 'cand'. None is not a
class.
```
We are using Sphinx v4.5.0. Any ideas why this is happening?
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