Pokemon Y no background sound

I started playing yesterday and it went very fine and suddenly citra ask me to update so i update it and When i restart it,my game doesnt have background sound but the sound of the button and pokemon are still there.only the background sound thats misssing.before i update it,There are still have background sound

In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.