http://paste.feed-the-beast.com/view/d6afd0fc
Issue between mineshaft generation. Crash is on world creation with Cave Control installed.

Last time I saw a crash like that was about 2 years ago with Oceancraft (and the devs for that mod did something on their end to fix it). At least I'm more aware of the cause this time, so a fix for this will come out at some point in the near future.