Need help with burning with DVDIt-LE

[Eliezer]

I am trying to burn a disc of my 103 min (about 4 GB) MPEG-2 movie made with Premier 6.5 and Encoder 1.2. Burning program is DVDIt-LE. The movie is made of 5 buttons, and the program had no problem with the movie's size in the beginning. But on stage "Preroll" I receive a message:
"Could not complete the last command because string too long".

What does it mean? How can I fight it?
Thank you for any help.

Eliezer