You see one of these two alert messages:
Click on the MUSICMATCH Jukebox Playlists icon, then click back on the iPod.
To prevent this in the future, do not select synchronize unless there have been changes to the MUSICMATCH Jukebox library or playlists.
Additional Information
This usually happens if you select synchronize when there has been no change since the last synchronization between MUSICMATCH Jukebox and the iPod.