Copying playstation games

[bigkev]

last ngiht i tried to make a copy of smackdown 2 for cousin by doing a cd to cd copy it was successful. however when i out the cdr in that had the copy of the game and i turned on playstation it said insert a playstation game. I have the 9000 series of the playsation befroe ps one and i have a iomega preadator. Also a freind of mine made a copy of a ps game and the it worked for here and played. What am i doing wrong or need to do?
Please help