This happens when I try to launch my game.
inb4: It is not the Optifine causing problems, I tried it without Optifine and got the same error, and in my other modpack it works well with Optifine.
Crash log: http://pastebin.com/akmhcz7d

Have you replicated this with only botania installed, if not then take out all your mods and add them back in one at a time until you find which one causes the crash

Ok, the problem was in Blocks3D Mod. Any ways to solve it (except deleting)?

Assuming that their mod is done through core modding it is unlikely, you best bet is to delete it atm and submit a bug report to them so that they know about the incompatibility so that they know about it and in future may be able to find a solution.