[Discuss-gnuradio] Re:Test-bed application: how to control GUI app and gr_vector_source

[Francisco Llaryora]

Hi Andis Dembovskis:
i tried to run your script, but the program stoped and  get following error:

done_part_1
audio_alsa_sink[hw:0,0]: snd_pcm_hw_params failed: Descriptor de
archivo en mal estado
Traceback (most recent call last):
  File "programafallido.py", line 56, in <module>
    app.tb.start()
  File "/usr/lib/python2.6/dist-packages/gnuradio/gr/top_block.py",
line 97, in start
    self._tb.start()
  File 
"/usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_swig_py_runtime.py",
line 1455, in start
    return _gnuradio_swig_py_runtime.gr_top_block_sptr_start(self)
RuntimeError: check topology failed on audio_alsa_sink(1) using
ninputs=1, noutputs=0

do you know how to solve the problem?
thanks in advance.