Error creating DVD files

hi i’ve encountered a problem while trying to clone the DVD jus now. i’ve tried 3 time and during the process of writing …about 45% a pop up tells me - cyclic redundancy check- G:/VIDEO_TS_01_3.VOB - READ ERROR . so im wondering whats the problem with it…i tried to copy directly in NERO.the same problem shows up too. kindly help me thanx!

[ file 1 G:/VIDEO_TS/VTS_01_3.VOB23 TCSectorReader ]

Sounds like a dirty/scratched disk. Either try cleaning/repairing the disk, or try a different DVD-ROM to read with.

issit? i have done it already…clean with the cleaning solution…i can play it on my dvd player and comp…and watch it perfectly…but cannot burn