Itunes U help with Ipod Classic??

I have an Ipod Classic 160gb model.. and I'm trying to download videos from Itunes U (language videos)..

I can download them fine, but whenever I actually sync my ipod, it says there is an error because my ipod has the wrong video format set??

How do I cange my video format to allow myself to view these Itunes U videos?

Or is my Ipod Classic the problem?

Please help, thankyou! =)