Cound not read the wavs under dir of "data/test/Mu - Too Bright"

Using soundfile:
raise RuntimeError(prefix + _ffi.string(err_str).decode(‘utf-8’, ‘replace’))
RuntimeError: Error opening ‘mixture.wav’: File contains data in an unknown format

Using wave:
raise Error(‘file does not start with RIFF id’)
wave.Error: file does not start with RIFF id

Hi, please check this out: