DVD Shrink Help!

i been using dvd shrink for a time now and now when i back up some movies i get a error that says Cyclic Redundancy Check any ideas this might be.im a newbie here.

your drive is having a problem reading the disc(dirt scratch etc.), try cleaning it or try dvd decrypter and rip to your hard drive first. dvd decrypter will keep trying numerous times to read the disc before it gives up.