Late last night I got to the final boss in The Simpsons Game, but since it was late I quit. Today I decided to give it another try, and it says "The Simpsons saved game appears to be damaged and cannot be used."

I popped in another game, and the saves there seem fine. Is there any way to fix this? I don't want to restart the game just to play the last battle.

I'm sure this won't help, but the only thing that I can think of to try is to move it to another device and try it from there.

The first time I played The Simpsons game it did this to me as well.
Luckily I was only thru the first couple of levels.

It's been a while since I've tried my 2nd game save, but so far so good.