The button that says "Info" near the bottom right of ANY challenge page in the Lexica Botania causes a crash when clicked. There isn't much more to say, so here is an image and FML Log.

FML Log: http://pastebin.com/3wyduudQ

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EDITED - Sorry Vazkii, it's my first bug report :3

Reproduced with success in Botania 196, but couldn't copy the crash log.