combat arms hack not working

hey im using an undetected hack on combat arms and using perx injector
it all works until i load up the game it will crash right when the running man leaves the screen it does this with all the undetected hacks

please some one help

and yes in the injector i do put engine or engine.exe
and put the dll file in the part where it says browse dll files

and i do put it on auto inject