Crash report from my server! HOW DO I FIX?

[MrPalmTree]

Ok so I am using a custom modpack server and my server loads fine but then after a couple seconds it shows this...

 

---- Minecraft Crash Report ----

// Why did you do that?

 

Time: 11/12/14 16:46

Description: Exception in server tick loop

 

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

at net.minecraft.server.management.PlayerManager.<init>(PlayerManager.java:55)

at net.minecraft.world.WorldServer.<init>(WorldServer.java:113)

at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:246)

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

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)

at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

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

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)

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

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

... 6 more

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

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

at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)

... 8 more

 

I think it may be a mod but im not quite sure... Please help me with this error.

 

FULL LOG HERE: http://pastebin.com/1WqqBJyc

Edited December 11, 2014 by MrPalmTree

[plowmanplow]

Bless you for using a pastebin for your log contents.

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

This means you have a client-only mod in your server. At a minimum, you will need to remove these mods from your server:

• NotEnoughKeys
• NEIPlugins