Ello, I was making a small harmless minecraft private modpack (consisting of Optifie, invtweaks and others to come but, I tried getting InvTweaks to work, I followed the instructions on installing InvTweaks and I got this crash message:
http://pastebin.com/cG7pYMmh
Yes, I did try making spoilers and failed, So I used Pastebin instead! Sorry