It's probably because gmusicbrowser doesn't find a valid amixer control.
Check the amixer setting in gmusicbrowser's setting dialog ->Audio -> advanced 
options (in mplayer or mpg321/...).
I'll improve the error message and how gmusicbrowser choose the amixer setting 
in a future version..

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volume control gives error message
https://bugs.launchpad.net/bugs/239781
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