DVD to iPod

hey guys
ok so i got a new iPod classic for christmas.
i downloaded dvdfab platinum so that i could put my dvds onto it.
my problem is that when i put the dvd into the drive, it doesn’t recognize it.
what do i have to do to fix it?
if you could help me out that would be just amazing.
thanks!
dancingmegan

Does it happen with all DVD’s or one in particular?