Why isn't my ipod nano syncing?

I have all of my playlists and everything made now but everytime that I go to sync it, It states that I dont have some kind of disc? It's not a problem with the Ipod itself because my boyfriend can sync it on his computer.

Hi,

Can you post the exact error message as an answer to this question? I will be able to help you if I know exactly what iTunes says.

Thanks.

It says. ' The Ipod 'Beth's Ipod' cannot be synced. The Required Disc cannot be found.