AttributeError: 'NoneType' object has no attribute 'dtype'

When I try to make an inference by outputting the file name, I get this error.

Traceback (most recent call last):
  File "/opt/conda/bin/rvc", line 8, in <module>
    sys.exit(main())
  File "/opt/conda/lib/python3.10/site-packages/rvc/utils/cli/cli.py", line 29, in main
    cli()
  File "/opt/conda/lib/python3.10/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/opt/conda/lib/python3.10/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/opt/conda/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/conda/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/conda/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/opt/conda/lib/python3.10/site-packages/rvc/utils/cli/handler/infer.py", line 130, in infer
    wavfile.write(outputpath, tgt_sr, audio_opt)
  File "/opt/conda/lib/python3.10/site-packages/scipy/io/wavfile.py", line 771, in write
    dkind = data.dtype.kind
AttributeError: 'NoneType' object has no attribute 'dtype'

And when I put "-o" as a folder, it gives an error saying it is a directory Sorry for the bad English, I used Google Translate