Clonedvd: "invalid file size" msg - help

i am trying to make a copy of “bad Santa” dvd but when it comes to selecting the file in Clonedvd the following comes up where the video preview should appear:

D:/VIDEO_TS/VTS_02_2.VOB: invalid file size
(OSUtill0 [W string])

i can continue to the copy but when i hit the “go!” button the same message appears.
can anyone help?

Pop the dvd in and fire up DVD Shrink, see if it comes up with the same error when analyzing it. Could be extra protection.