The rest of the messages goes:
An unknown error occured (-50).
The ipod has the most updated software it can accomodate (IOS 6.x). I have never seen this error before.
iTunes displays -50 error message when syncing iPod on Windows XP
-50 Error occurred while backing up this...: Apple Support Communities
iTunes: "-50" alert when syncing your iOS device to iTunes 10.3
Retrieving data ...