run time error

[sravani40]

in
6 if decoder.decode_wav_file(WAVFILE):
7
----> 8 s, l = decoder.get_decoded_string()
9
10 print(u"*****************************************************************")

~/anaconda3/lib/python3.8/site-packages/kaldiasr/nnet3.pyx in kaldiasr.nnet3.KaldiNNet3OnlineDecoder.get_decoded_string()

For some files it is giving output. But for some files it is giving error like this. Audio file properties are same.