Sound doesn't work in shmupmametgm

When I run the .exe, I get this error:

and then sound does not play in any game I try.
Does anyone know how to fix this?

 

It looks like your Mame settings file has an error. Inside mame.ini, the sound setting should be 1:

Code:

sound                     1

I've attached the default shmupmametgm mame.ini file just in case (created using mametgm64 -cc).