```python
Raised when trying to access a hf.co URL with a valid repository but an invalid
revision.

Example:

```py
>>> from huggingface_hub import hf_hub_download
>>> hf_hub_download('bert-base-cased', 'config.json', revision='<non-existent-revision>')
(...)
huggingface_hub.utils._errors.RevisionNotFoundError: 404 Client Error. (Request ID: Mwhe_c3Kt650GcdKEFomX)  
Revision Not Found for url: https://huggingface.co/bert-base-cased/resolve/%3Cnon-existent-revision%3E/config.json.
```
```