RuntimeError: audio_alsa_sink

GNU Radio
1

Hi,
When trying to use audio sing in GRC 3.6.1, I get the error(which is
in image form in attachment). I surfed the forums for similar error, but
could not find a proper solution. Moreover changing the sample rate has
no change in error. Please help me out with this error.

Regards,
Ravi Sharan
Intern(IIT Hyderabad)

2

Please Someone Reply to this post. Am frustrated whenever I see that
error message.

3

Someone please help me out with this error. Am new to GNU Radio stuff.
Its almost two weeks since I posted this error message and reply yet ?