[Discuss-gnuradio] "check topology failed"

[meggahertz]

Can anyone please tell me that why I am getting the following message when 
running tx_voice.py:

>>> gr_fir_fff: using SSE
Warning: failed to enable realtime scheduling
audio_alsa_source[hw:0,0]: set_channels failed: Invalid argument
terminate called after throwing an instance of 'std::runtime_error'
  what():  check topology failed on audio_alsa_source(11) using ninputs=0, 
noutputs=1
Aborted (core dumped)

Thankyou

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