Wtf, please help

Hey, i use D2Loader, this just recently started happening, i have even reinstalled the game. Whenever i start diablo, i join a game, then when i save and exit the game i try to join another game, about 10-15 sec into the game, no matter what i am doing i get the error "We got a big error here " i would like to know why this is happening. What usually happens is whenever i shut the game down, that error happens, but its annoying, i cant even bot when i join my 2nd game.