java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient 17:32:31 at java.lang.Class.forName0(Native Method) ~[?:1.7.0_21] 17:32:31 at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_21] 17:32:31 at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:59) ~[ProxyInjector.class:1.7.10-1492.152] 17:32:31 at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:512) ~[FMLModContainer.class:1.7.10-1492.152] 17:32:31 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_21] 17:32:31 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[server-1.7.10.jar:?] 17:32:31 at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212) ~[LoadController.class:1.7.10-1492.152] 17:32:31 at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190) ~[LoadController.class:1.7.10-1492.152] 17:32:31 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_21] 17:32:31 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_21] 17:32:31 at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[server-1.7.10.jar:?] 17:32:31 at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[server-1.7.10.jar:?] 17:32:31 at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119) [LoadController.class:1.7.10-1492.152] 17:32:31 at cpw.mods.fml.common.Loader.loadMods(Loader.java:513) [Loader.class:1.7.10-1492.152] 17:32:31 at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87) [FMLServerHandler.class:1.7.10-1492.152] 17:32:31 at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:319) [FMLCommonHandler.class:1.7.10-1492.152]

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Samebug tips

,
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 takaqiao
, 1 year ago
net/minecraft/client/multiplayer/WorldClient 17:32:31 at java.lang.Class.forName0(Native Method) ~[?:1.7.0_21] 17:32:31 at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_21] 17:32:31 at cpw.mods.fml.common.ProxyInjector.inject
java.lang.RuntimeException: Attempted to load class bjf for invalid side SERVER
at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:51)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:176)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:631)
at java.lang.Thread.run(Unknown Source)

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