Massive

Hi im trying to create a tekkit lite server, everything works fine i can enter the world, build houses, craft items.. etc... there's just 1 problem. Only iron and coal spawn where they are supposed to. When i go into the IC2 config file and set the value to "true" for Tin and Copper, i get a crash when i start the server... Can anybody help? I would be happy to provide more info to anybody who is willing to help Regards Massive