Need help copying a copied DVD!!!

Hi...
I use the program DVD XCOPY Platinum and when I try to copy a DVD that I already copied, I am unable too. It won't even recognize the copied DVD as an actual DVD. Is there a program that would allow me to insert the missing files or allow me to copy the copies? I am able to copy normal DVD's without any problems. Thanks a lot.
Brian

you'll probably have to use the original dvd. *long story why*