won't launch tekkit?

poppop4231 · 2012-08-02T10:59:28+0000

okay guys! since i know that you're all very experienced tekkiter's, i need your help! so listen up. so i open my the technic launcher from %appdata% and pick tekkit, i type in my password and username and click play. but... when the little minecraft/tekkit window pops up saying mojang, then after a few seconds, poof! it's gone! can anyone help me? i really wanna get started with tekkit!