Can't play music on new MacBook Pro
I recently copied my music files, including my iTunes music, from my old iMac to my new MacBook Pro, but am unable to play music from my new computer. I get a message which says "You cannot disable playback to the local computer unless you select another AirPlay device for playback first." Not exactly sure what that means! Any help would be appreciated.
iPhone 6s, macOS Sierra (10.12.1)