crack not working on discjuggler and error message on dj 2.0

I don't know why dj 2.0 doesn't work with the crack : when I apply the crack, I can't open dj 2.0. HELP !!!!!
Is discjuggler 2.0 better than dj 3.0 ?

I have an error when I burn a cd which says :
"LC or unreadable error" what is it ? Can I play to the game or not ?

Where can I get dj 3.0 FULL VERSION ?

Thanks in advance