Problem trying to burn DVD Video


Can anyone help me please, when I try to burn some VOB, BUP and IFO files (DVD files) I get the following:

19:40:19 TDK DVDRW0404N
Invalid field in command
19:40:19 TDK DVDRW0404N
Could not perform start of Disc-at-once
19:40:19 Burn process failed at 4x(5,540 KB/s)

Can anyone tell me what is wrong?
It burns CD-RW’s with no problem, it just wont burn DVD-R-s.

Thanks In Advance