Dvd manager Error - dvd manager 5 4 common 065

Can anyone help me - when i put a disc into my drive to backup i get the above error message …it has just started happening and i cant work it out !!
thanks for any replies.

Looks like a mastering error on a very low level. Are other DVDs working?

ithanks for your reply
t seems to be happening only on certain discs …
am only new at this so could be something really simple !!

This error should not happen when processing original DVDs. Probably they are hand-made, recorded or mastered using some other software product?