Boot Disk Not working! HELP!

[DanceRevolution]

I bought a PSX Boot Disk so i could play the game Dancing Stage EUROMIX, however when i try to play it it says "Software Terminated Console May Have Been modified..." I read the thing about needing Anti Mode Chip Codes but i dont know what the heck those are, where to get them, or anything about them. Can someone tell me the needed codes for this Game? By the way, i have the American Playstation and this game is PAL