lease,Please tell me how to corect the error AttributeError: 'Microphone' object has no attribute 'create_decoder'

I ran microphne.py in ras-pi 4 and next error happend.
Please tell me how to correct the error
i.e.
Exception in thread Thread-1:
Traceback (most recent call last):
File “/usr/lib/python3.7/threading.py”, line 917, in _bootstrap_inner
self.run()
File “/usr/lib/python3.7/threading.py”, line 865, in run
self._target(*self._args, **self._kwargs)
File “microphone.py”, line 330, in task
mic = Microphone(quit_event=quit_event)
File “microphone.py”, line 109, in init
self.decoder = decoder if decoder else self.create_decoder()
AttributeError: ‘Microphone’ object has no attribute ‘create_decoder’
(at File “microphone.py”, line 109, in init)