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  1. ,
    via minecraftforum.net by Unknown author

    The stack trace shows which mod caused the problem (in my case it was at com.pahimar.ee3.reference.Textures.<clinit>, so the mod in question is EE3). Remove or reinstall that mod.

Solutions on the web

via GitHub by bear989
, 1 year ago
net/minecraft/client/multiplayer/WorldClient
java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient at gregtech.common.GT_Proxy.onWorldTickEvent(GT_Proxy.java:1222) at cpw.mods.fml.common.eventhandler.ASMEventHandler_4_GT_Proxy_onWorldTickEvent_WorldTickEvent.invoke(.dynamic) at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140) at cpw.mods.fml.common.FMLCommonHandler.onPreWorldTick(FMLCommonHandler.java:268) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:620) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 10 moreCaused by: java.lang.RuntimeException: Attempted to load class bjf for invalid side SERVER at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50) at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ... 12 more