HuggingFace Model Not Found: 'sentence-tranformers/all-MiniLM-L6_v2'

HI There,
I am using the script to download the model but seems its fails with the following error message:

File “/home/XXXX/Download_model.py”, line 29, in hf_model
raise HFModelNotFoundError(model_str)
main.HFModelNotFoundError: HuggingFace model not found: ‘sentence-tranformers/all-MiniLM-L6_v2’

Any pointer will be greatly appreciated.
proxies = {‘https_proxy’:os.getenv(‘https_proxy’),
‘http_proxy’: os.getenv(‘http_proxy’) }

snapshot_path = snapshot_download(
repo_id=args.model_name,
revision=args.revision,
cache_dir=args.model_path,
use_auth_token=True,
proxies = proxies,
)