How to prepare a movie for sharing in Media Browser?

I'm having difficulty making a DVD. After creating the movie, I have tried sharing it to iDVD and Media Browser, but both times after rendering it said it wasn't able to publish. The movie shows up in my Media Browser of the DVD but it can't be dragged to the project window. I'm trying to share it by selecting Large.

My movie is only 8 minutes. I tried sharing a video clip, selecting Large, and it worked so the system works, it's just my movie won't work.

How do I get my movie to share so I can use it in iDVD?