Help!!!

I cannot get my game to load. Every time I try to load it, it says 'Invalid XML, root element is missing'.
I've tried to open it with a text editor and all it says is
NULNULNULNULNUL (YOU GET THE IDEA)

I'm pretty sure the game is still there, because the memory size of the game looks about right.

Any ideas on how I can get it back.