Issue : Itunes keeps cancelling sync ???

Possible solutions :-

1)
When sycning songs you will see what is syncing at the top in itunes. There will be a song that takes a little bit and then gets skipped and almost immediately after the next song starts, itunes will cancel. You must find the first song and remove it, then itunes will sync the rest. Then idk how to get the removed song on there....zerk

EX.

Roar is sycing.................................passed
Berzerk is syncing....failed

Remove Roar and try again to sync

2) Try below link :
http://support.apple.com/kb/TS1286?viewlocale=en_US&locale=en_US

3)

1. Made sure that my iTunes was updated.
2. Recreated my iTunes Library (hold option while opening iTunes- on mac- and choose to create a new library. Make sure that you move your music to another folder while doing this, and overwrite the old library by naming it the same thing.)
3. Restarted my computer and iPhone.
4. Synced my phone, and it worked perfectly!