When did this crash happen, at startup or during the game? What did you do right before it crashed? Also, Forge log plz.
The crash occurs after selecting a world. The UI flashes for less than a second and crashes.
Crash log again (the first paste expired): http://pastebin.com/Uz0ERGGy
The Forge log is much larger than Pastebin will allow. I've uploaded it for download here: http://s000.tinyupload.com/?file_id=07390405363258614468 if there's a better way you'd like me to provide it to you I'd be happy to comply.