I managed to crash my server because the tubes in redpower overloaded themselves with snow so it causes huge lag so i thought about reloading my server without redpower from singleplayer. But when I try to remove redpower from the modlist with the FTB client it doesn't launch the game and gives me the error that FML with my minecraft installation. How do I resolve these problems? I either need to get rid of all the floating blocks from the world or then remove RedPower 2 temprorarily (missing blocks later is not a problem)