WWF No Mercy Problem???

Hi im New and i have a Problem with my PJ64 Emulator:

every time i Play WWF No Mercy when i perform an Special move one or two times this message Shown and the game is over:

UNHANDLED R4300i OpCode at: 800EFFFF
UNKNOWN 49 10 23 D4
Stoping EMULATION ! WHAT MEANS THIS AND HOW CAN I FIX THIs??

PPPLLLEEAAASSEE???

PS:sorry for my Bad English im German!!!

Pppppllllllleeeeeeeeeaaaaaaasssssseeeee?????????????

i played it before my Computer "Crashed" with Cheats but now it doesnt works i asked on so many sites but no body can help me this really piss me of?????

PLEASE HELP ME????????

PS:My wrestlemania 2000 game works Fine but why no mercy is so a piece of shit??