Error in torchaudio.load when loading dataset

I tried to learn using the LibriSpeech dataset but failed

I was able to get into DataLoader, but I got an error at for i, (___) in enumerate(train_loader):
Apparently it’s at torchaudio.load

Traceback (most recent call last):
  File "", line 187, in <module>
  File "", line 181, in main
    chapter_id,utterance_id,) in enumerate(train_loader):
  File "C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torch\utils\data\", line 681, in __next__
    data = self._next_data()
  File "C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torch\utils\data\", line 721, in _next_data
    data = self._dataset_fetcher.fetch(index)  # may raise StopIteration
  File "C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torch\utils\data\_utils\", line 49, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torch\utils\data\_utils\", line 49, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "C:\Users\PC_User\Desktop\ml-agents-0.15.0\mem_apri_tests\AI\voice_net2\", line 133, in __getitem__
    return load_librispeech_item(fileid, self._path, self._ext_audio, self._ext_txt)
  File "C:\Users\PC_User\Desktop\ml-agents-0.15.0\mem_apri_tests\AI\voice_net2\", line 55, in load_librispeech_item
    waveform, sample_rate = torchaudio.load(file_audio)
  File "C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torchaudio\backend\", line 16, in load
    raise RuntimeError("No audio I/O backend is available.")
RuntimeError: No audio I/O backend is available.

I don’t know if it’s related, but I also get a warning like this

C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torchvision\io\ UserWarning: Failed to load image Python extension:
  warn(f"Failed to load image Python extension: {e}")
C:\Users\PC_User\Anaconda3\envs\newflan22a08m14d\lib\site-packages\torchaudio\backend\ UserWarning: No audio backend is available.
  warnings.warn("No audio backend is available.")

pytorch 1.12.1 py3.7_cuda11.3_cudnn8_0 pytorch
python 3.7
os win10

Here is the reference

Your torchaudio build doesn’t find any supported backend.
On Windows soundfile would be the default as exmplained here, but you might need to follow these instructions first:

"soundfile" backend requires SoundFile. Please refer to the SoundFile documentation for the installation.