Problem w/ source code when using Toast. PLEASE HELP!!!!
 

I have had this same problem when trying to back-up 3 different DVDs. I currently am using a Mac G4 with OSX (Panther), and have a superdrive.

I rip the data using MacTheRipper.
Compress it to under 4.7Gb w/ DVD2One.

Then, when I try to burn the DVD-R in Toast v6.1, half through the encoding it says "Could not record the disk because there is a problem with the source material. Result Code = -18774"

Can someone please help me figure out why it keeps saying this?