"Error #-1 was reported..." No disk image created

I created a new project, using the iDVD 4.0 movie projector theme. I dropped a 75 minute movie onto the theme that I created in Final Cut Pro and exported as a self contained movie. It has chapters and there are 5 pages of scene selection submenus. I put a :30 clip into the drop zone in the main menu and each of the submenu pages. I changed the default font to American Typewriter, and its color to white instead of the default color. All seemed well.

I chose Save as Disk Image and let it rip. I checked on it occasionally, and it seemed to be burning right along; I could see the footage passing in the burn window. At the end of the ordeal, I got a message that "Error #-1 was reported...", and I have no disk image and no encoded assets.

What's up with that? I had saved an almost identical project as a disk image a couple of days ago, and have used the same two movies for this one. The differences are that I made a couple of fixes in the movie, and that I exported as self contained instead of reference movie.

I have been using iDVD 5 since it came out, and had very good luck. But this project is giving me a headache. Any suggestions?

Thanks.

BC