GPT2 model missing. GPT2Decoder gives HTTP 404 error

[QMrpy]

Hi, I have been trying to use texar-pytorch in my experiments, but when I try to use the GPT2Decoder module, I get HTTP 404 error. I am getting this error for both gpt2-small and gpt2-medium. Is the model missing? This is the traceback of the error:

Traceback (most recent call last):
  File "texar_enc_dec.py", line 113, in 
    main(args)
  File "texar_enc_dec.py", line 79, in main
    model = ConditionalGPT2Model(args, datasets["train"].target_vocab.size)
  File "texar_enc_dec.py", line 18, in __init__
    self.decoder = tx.modules.GPT2Decoder("gpt2-small")
  File "/home/t-rsarkar/.local/lib/python3.7/site-packages/texar/torch/modules/decoders/gpt2_decoder.py", line 69, in __init__
    self.load_pretrained_config(pretrained_model_name, cache_dir)
  File "/home/t-rsarkar/.local/lib/python3.7/site-packages/texar/torch/modules/pretrained/pretrained_base.py", line 138, in load_pretrained_config
    self.pretrained_model_name, cache_dir)
  File "/home/t-rsarkar/.local/lib/python3.7/site-packages/texar/torch/modules/pretrained/pretrained_base.py", line 220, in download_checkpoint
    maybe_download(path, cache_path)
  File "/home/t-rsarkar/.local/lib/python3.7/site-packages/texar/torch/data/data_utils.py", line 105, in maybe_download
    filepath = _download(url, filename, path)
  File "/home/t-rsarkar/.local/lib/python3.7/site-packages/texar/torch/data/data_utils.py", line 132, in _download
    filepath, _ = urllib.request.urlretrieve(url, filepath, _progress_hook)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 247, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/anaconda/envs/py37_default/lib/python3.7/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

I am using the following versions of the libraries:

texar-pytorch==0.1.2.post1
torch==1.8.1

Any help will be appreciated. I may be doing some stupid mistake, so, forgive me in advance.