Missing @McVersion: codechicken.core.launch.CodeChickenCorePlugin thaumcraft.codechicken.core.launch.DepLoader 19.12 18:55:53 [Server] WARN The following coremods do not have a @McVersion annotation. They may cause problems if this is not the correct version of Minecraft for them.
@Foghost This is a problem with ChickenCore (Which I believe is a Mod). You may want to go to his forum and post about this problem.