[Discuss-gnuradio] Newbie question: RuntimeError: audio_alsa_sink

[keval]

Greetings.
Got gnuradio compiled, made, and actually ran the dialtone test last night. 
However, when I attempted the same this morning, I got the following message
(which, I have to say, I've gotten before but thought last night's test had
eliminated).  
Any thoughts?
Kevin

  File "<stdin>", line 2, in <module>
  File "<stdin>", line 7, in build_graph
  File "/usr/lib/python2.5/site-packages/gnuradio/audio_alsa.py", line 228,
in sink
    return _audio_alsa.sink(*args)
RuntimeError: audio_alsa_sink

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