Hi, I just set up a minecraft forge server on my computer (1.7.2) and when I try to start it, it reports this error:

 

 

 

---- Minecraft Crash Report ----

// Would you like a cupcake?

 

Time: 20/09/14 12:23

Description: Exception in server tick loop

 

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient

at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)

at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)

at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:318)

at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:187)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:669)

Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient

at java.lang.Class.getDeclaredConstructors0(Native Method)

at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)

at java.lang.Class.getConstructor0(Unknown Source)

at java.lang.Class.newInstance(Unknown Source)

at cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.<init>(SimpleChannelHandlerWrapper.java:22)

at cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.getHandlerWrapper(SimpleNetworkWrapper.java:129)

at cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.addClientHandlerAfter(SimpleNetworkWrapper.java:123)

at cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.registerMessage(SimpleNetworkWrapper.java:111)

at thehippomaster.AnimationAPI.AnimationAPI.init(AnimationAPI.java:27)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

at com.google.common.eventbus.EventBus.post(EventBus.java:267)

at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

at com.google.common.eventbus.EventBus.post(EventBus.java:267)

at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:690)

... 5 more

Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 41 more

Caused by: java.lang.RuntimeException: Attempted to load class biz for invalid side SERVER

at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)

at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174)

... 43 more

 

 

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

 

-- System Details --

Details:

Minecraft Version: 1.7.2

Operating System: Windows 7 (amd64) version 6.1

Java Version: 1.7.0_67, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 1714822552 bytes (1635 MB) / 2058878976 bytes (1963 MB) up to 2058878976 bytes (1963 MB)

JVM Flags: 2 total; -Xmx2G -Xms2G

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

FML: MCP v9.03 FML v7.2.211.1121 Minecraft Forge 10.12.2.1121 6 mods loaded, 6 mods active

mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized

FML{7.2.211.1121} [Forge Mod Loader] (forge-1.7.2-10.12.2.1121-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized

Forge{10.12.2.1121} [Minecraft Forge] (forge-1.7.2-10.12.2.1121-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized

animatedplayer{1.5.0} [Animated Player Mod] (AnimatedPlayer-1.7.2-1.5.0.jar) Unloaded->Constructed->Pre-initialized->Initialized

AnimationAPI{1.2.2} [AnimationAPI] (AnimationAPI-1.7.2-1.2.2.jar) Unloaded->Constructed->Pre-initialized->Errored

MutantCreatures{1.4.5} [Mutant Creatures] (MutantCreatures-1.7.2-1.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized

Profiler Position: N/A (disabled)

Is Modded: Definitely; Server brand changed to 'fml,forge'

Type: Dedicated Server (map_server.txt)

 

 

 

How would I go about solving this problem?

Would re-installing the server help?

Thanks

I deleted that and it had no affect so I deleted all of the mods to expand on your point and it solved the issue. Thanks.

How can I find out whether a mod is client or server based?