AutoTokenizer unable to load pre-trained bert-base-uncased tokenizer
Hello! I am running the following code to load the bert-base-uncased tokenizer:

```py
from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained('bert-base-uncased')
```
which results in the following error:

```
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-6-ff60bf5b2785> in <module>
----> 1 tokenizer = AutoTokenizer.from_pretrained('bert-base-uncased')

~/opt/miniconda3/lib/python3.8/site-packages/transformers/models/auto/tokenization_auto.py in from_pretrained(cls, pretrained_model_name_or_path, *inputs, **kwargs)
    548             tokenizer_class_py, tokenizer_class_fast = TOKENIZER_MAPPING[type(config)]
    549             if tokenizer_class_fast and (use_fast or tokenizer_class_py is None):
--> 550                 return tokenizer_class_fast.from_pretrained(pretrained_model_name_or_path, *inputs, **kwargs)
    551             else:
    552                 if tokenizer_class_py is not None:

~/opt/miniconda3/lib/python3.8/site-packages/transformers/tokenization_utils_base.py in from_pretrained(cls, pretrained_model_name_or_path, *init_inputs, **kwargs)
   1639         if os.path.isfile(pretrained_model_name_or_path) or is_remote_url(pretrained_model_name_or_path):
   1640             if len(cls.vocab_files_names) > 1:
-> 1641                 raise ValueError(
   1642                     f"Calling {cls.__name__}.from_pretrained() with the path to a single file or url is not "
   1643                     "supported for this tokenizer. Use a model identifier or the path to a directory instead."

ValueError: Calling BertTokenizerFast.from_pretrained() with the path to a single file or url is not supported for this tokenizer. Use a model identifier or the path to a directory instead.
```

The same error does not occur when I use `bert-large-uncased` or any other model, which is very weird!

System/Package Spec:

```
OS: macOS Big Sur
transformers: 4.15.0
torch: 1.10.0 (cpu)
python: 3.8.3
```

do you have a folder named `bert-large-uncased` where you're running this code?<|||||>OMG! I just realized there's a file I downloaded long ago in this directory that's named `bert-base-uncased` wow is this embarrassing! 