When using the VCD preset to convert an Xvid to MPEG-1 I get the following message in Terminal:

2003-08-21 12:01:56.772 pbpaste[813] *** Uncaught exception: <NSInvalidArgumentException> *** -[NSCFDictionary setObject:forKey:]: attempt to insert nil value
Trace/BPT trap

What does this mean and how can I get it to work?