I just bought three TV Show episodes on ITunes and I am trying to put them on my 6th generation 80 GB iPod, but when I try to put them on, a box comes up and says, "[episode] was not copied to the ipod [my ipod] because it cannot be played on this ipod." I don't understand, I've already put movies and TV shows on my ipod without a problem, and I have 40 GB of space left. Can somebody help me?