action replay problem

i know , i know another action replay problem but for some reason whenever i put it on it says unkown game for some reason and i cant use the cheats , could somone help?

I had one for the lite and it never worked.

If you're using a DSi it won't work

If you're using a DSi it won't work

SadPSPAddict

the thing is not only does it say unknown game but all my codes have gone!