DVD size is too big!

I used DVD dycrypter and tranfered it to dvd shrink and when I click to backup an popup says that the current DVD size it too big! If you continue, you may be able to burn the resulting files…I did all that was necessary like make sure that it was on ‘Automatic’ compression, and even disabled some or tried all audio to see if that would work and it still said it was too big. What do I do?! I’m using DVD Shrink 3.2 something.
Thank you,

What DVD are you trying to back up?
Luvs Jenni