Nitepr freezes my psp screen :(

What happens is that when I start nite pr and activate a cheat it shows it is activated but when I prees the music note button It freezes it only happens in the yu gi oh tag force 1 game and I have checked every cheat one by one it happens in all the cheats and it freezes please can anyone tell me what to do I am soo much upset cause I just needed cheats for this game help would be appreciable please!!!!!!!!