Twilight Forest 2.0 Crash

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 3/3/14 1:13 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient
	at twilightforest.TwilightForestMod.<clinit>(TwilightForestMod.java:175)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:270)
	at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:443)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	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:209)
	at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:188)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	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:119)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:484)
	at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:78)
	at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:296)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:152)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:622)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 31 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:51)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174)
	... 33 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: Linux (amd64) version 3.11.0-17-generic
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 130397344 bytes (124 MB) / 449839104 bytes (429 MB) up to 2885681152 bytes (2752 MB)
	JVM Flags: 1 total; -Xmx3096M
	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 v9.01-pre FML v7.2.116.36 Minecraft Forge 10.12.0.1033 14 mods loaded, 14 mods active
	mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
	FML{7.2.116.36} [Forge Mod Loader] (mcpc-plus.jar) Unloaded->Constructed
	Forge{10.12.0.1033} [Minecraft Forge] (mcpc-plus.jar) Unloaded->Constructed
	BuildCraft|Core{5.0.3} [BuildCraft] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	BuildCraft|Builders{5.0.3} [BC Builders] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	BuildCraft|Energy{5.0.3} [BC Energy] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	BuildCraft|Factory{5.0.3} [BC Factory] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	BuildCraft|Transport{5.0.3} [BC Transport] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	BuildCraft|Silicon{5.0.3} [BC Silicon] (buildcraft-5.0.3.61.jar) Unloaded->Constructed
	Dynmap{1.9.2-50} [Dynmap] (Dynmap-1.9.2-forge-10.12.0.jar) Unloaded->Constructed
	IC2{2.1.416-experimental} [IndustrialCraft 2] (industrialcraft-2_2.1.416-experimental.jar) Unloaded->Constructed
	IronChest{6.0.4.713} [Iron Chest] (ironchests.jar) Unloaded->Constructed
	TwilightForest{2.0.0} [The Twilight Forest] (twilightforest-2.0.0.jar) Unloaded
	weaponmod{1.7.2 v1.14.2} [Balkon's WeaponMod] (weaponmod-1.14.2.jar) Unloaded
	Profiler Position: N/A (disabled)
	Is Modded: Definitely; Server brand changed to 'mcpc,craftbukkit,fml,forge'
	Type: Dedicated Server (map_server.txt)