FTB Launcher version: 1.2.2
Minecraft Version: 1.4.7 (DW20 5.0.1)
Java version: 7 update 13
Detailed description of the issue / how can the issue be recreated: After jumping through a few random Mystcraft ages, I finally got enough symbols to make a stable age. I write the age, open the book, click the box, and the world loads for a second and then I get the Server shutting down message, followed by the server has closed screen. This happens whenever I try to load the world now. I know nothing about trying to decipher logs, and searching the forums came up with nothing identical, so I'm posting this here.
Error logs: http://pastebin.com/PyahwdRW