I initially wondered if this was a compatibility issue with 8.2, but as I check for compatibility, I haven't had any issues running the Extended Music Room on 8.2. Can you try adding the music room to a fresh project to see if you get the same error? If not, try using Force Recompile for your current project to make sure you don't have any old files lying around, and perhaps double check that you don't have anything else named AudioBar in your project.