I just started using the mindcrack pack and set my gregtech config so the ic2 machines aren't the advanced crafting. When I try to make a world, it will say "building terrain" and under it it will say "Shutting down internal server". this happens every time I try to make a world. Also, when I made one world, I can play in it for 20 minutes then it says "Shutting down internal server". Please help!