Syncing photos to my ipod

could some one help me about my prblem i'm having? I tunes is not letting me sync photos to my ipod 2gb every time is syncing n its done at the end it says "The ipod Vick12 cannot be sycned. As uknown error occurred {-50}." so could plz help me with this error i been having problem 4 awhile and i just found out about this helping support. I will appreciate some 1 helping me plz.