So, I am using FTB on Mac. Whenever I try to launch DW20 1.6.4 (1.0.0 or 1.0.2) it says this in the console: http://pastebin.com/ef0SUK6C .
After this, it seemed like it is going to open MineCraft and start Forge, but just returned to the launcher screen. If I could get some help, that would be...