Error when running example from README: Invalid URL 'ner-fast'

I installed REL using pip and when running the minimal example from the README, I'm getting the following error:

```
/home/prangen/.local/lib/python3.10/site-packages/huggingface_hub/file_download.py:671: FutureWarning: 'cached_download' is the legacy way to download files from the HF hub, please consider upgrading to 'hf_hub_download'
warnings.warn(
2024-08-27 09:52:17,807 loading file /home/prangen/.flair/models/ner-english-fast/4c58e7191ff952c030b82db25b3694b58800b0e722ff15427f527e1631ed6142.d2c5731c75860f9743cc58e26828f6e0f447e3115da63d1ea50de876fde68cfe
2024-08-27 09:52:18,123 SequenceTagger predicts: Dictionary with 20 tags: , O, S-ORG, S-MISC, B-PER, E-PER, S-LOC, B-ORG, E-ORG, I-PER, S-PER, B-MISC, I-MISC, E-MISC, I-ORG, B-LOC, E-LOC, I-LOC, ,
Traceback (most recent call last):
File "/local/data/prangen/src/elevant/test_rel.py", line 14, in
tagger_ner = load_flair_ner("ner-fast")
File "/home/prangen/.local/lib/python3.10/site-packages/REL/ner/flair_wrapper.py", line 12, in load_flair_ner
return SequenceTagger.load(fetch_model(path_or_url, cache_root))
File "/home/prangen/.local/lib/python3.10/site-packages/REL/utils.py", line 18, in fetch_model
return get_from_cache(path_or_url, cache_dir)
File "/home/prangen/.local/lib/python3.10/site-packages/flair/file_utils.py", line 216, in get_from_cache
response = requests.head(url, headers={"User-Agent": "Flair"}, allow_redirects=True)
File "/home/prangen/.local/lib/python3.10/site-packages/requests/api.py", line 100, in head
return request("head", url, **kwargs)
File "/home/prangen/.local/lib/python3.10/site-packages/requests/api.py", line 59, in request
return session.request(method=method, url=url, **kwargs)
File "/home/prangen/.local/lib/python3.10/site-packages/requests/sessions.py", line 575, in request
prep = self.prepare_request(req)
File "/home/prangen/.local/lib/python3.10/site-packages/requests/sessions.py", line 486, in prepare_request
p.prepare(
File "/home/prangen/.local/lib/python3.10/site-packages/requests/models.py", line 368, in prepare
self.prepare_url(url, params)
File "/home/prangen/.local/lib/python3.10/site-packages/requests/models.py", line 439, in prepare_url
raise MissingSchema(
requests.exceptions.MissingSchema: Invalid URL 'ner-fast': No scheme supplied. Perhaps you meant https://ner-fast?
```

I have flair version 0.11.3 installed.

Any idea what might be the problem?

Thanks in advance!