In my serverlog it says "[chiselsandbits]: Unable to determine blocks eligibility for chiseling" for some of the blocks in the mod.
I read up on the error (ChiselsAndBits/Chisels-and-Bits#49) and it seems it can't be fixed by @AlgorithmX2.
These are the blocks:
vazkii.botania.common.block.mana.BlockSpreader attempted to load net/minecraft/client/Minecraft
vazkii.botania.common.block.mana.BlockPool attempted to load net/minecraft/client/Minecraft