BeechieMUFC

I'm wanting to add mods to tekkit, such as re adding the forestry mod, and others that i like, but the problem is when I'm adding it to the mods file when i then go to play tekkit in my single player world a grey screen comes up with a load of text and codes and it says 42 mods loaded but I can't do anything with it, hopes theres an fix to it or a way around it.