Server crashes when entering a new age with Biomes You Go installed

[ex0planetary]

I have a modpack with both Mystcraft and Biomes You Go (aka Oh The Biomes You'll Go). When I enter a new age I end up getting a server crash. Here's the crash report.

[XCompWiz]

There are a lot of mods installed here. Especially a lot of core mods. Can you produce a minimal test set? Bug Reporting Best Practices may help. Crash appears to be in the code of some mod using the namespace mod.mcreator. Something to do with it's bamboo forest.