I'm trying to export a movie from imovie 09 on my macbook pro. Filed not found?

It used to say error in using parameter list, but now it doesn't and now it says: "The project could not be prepared for publishing because an error occurred. (File not found)". How can I put back the file (if I moved it. I don't remember.) to the correct place, so I can export my imovie to idvd? Thanks for the help. I want to burn a video of my wedding to send to my mother in law. thanks Mac OS X 10.6