object reference not set to an instance of an object

I keep getting this error message after trying two mw3 tools now. I've been trying to fix it for hours and I've tried some other peoples solutions that I've seen but none seem to work. I saw some people say to change your rebug settings to simple settings but i don't even have that option in my dex settings. I'm on rebug 4.30.2rex btw.
Anyone have any suggestion of how to fix this?