Discussion Dont understand what I did wrong

[half eatn bagel]

I thought I did this completely right, and I got comfirmation that it looks good. But I cant figure out why I am getting an error, can someone look at this and tell me what I did wrong, specifically the classes. It was working until I tried to make the perks pro and change one classes special grenade to the at4.
http://www.megaupload.com/?d=NJWYQ235