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 Any idea how to fix it?
---- Minecraft Crash Report ----
// Oops.

Time: 7/14/14 11:41 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP
 at mod_TooManyItems.load(mod_TooManyItems.java:38)
 at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:539)
 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:45)
 at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
 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:201)
 at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
 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:45)
 at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
 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:112)
 at cpw.mods.fml.common.Loader.initializeMods(Loader.java:699)
 at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:107)
 at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:355)
 at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:142)
 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.entity.EntityClientPlayerMP
 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 ... 29 more
Caused by: java.lang.NullPointerException


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

-- System Details --
Details:
 Minecraft Version: 1.6.4
 Operating System: Linux (amd64) version 2.6.18-371.1.2.el5
 Java Version: 1.7.0_51, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 327815096 bytes (312 MB) / 470286336 bytes (448 MB) up to 954728448 bytes (910 MB)
 JVM Flags: 2 total; -Xmx1024M -Xms256M
 AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 Suspicious classes: FML and Forge are installed
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML: MCP v8.11 FML v6.4.45.953 Minecraft Forge 9.11.1.953 8 mods loaded, 8 mods active
 mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
 FML{6.4.45.953} [Forge Mod Loader] (minecraftforge-universal-1.6.4-9.11.1.953.jar) Unloaded->Constructed->Pre-initialized->Initialized
 Forge{9.11.1.953} [Minecraft Forge] (minecraftforge-universal-1.6.4-9.11.1.953.jar) Unloaded->Constructed->Pre-initialized->Initialized
 TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
 TConstruct{1.6.X_1.5.5.7} [Tinkers' Construct] (TConstruct_mc1.6.4_1.5.5.7.jar) Unloaded->Constructed->Pre-initialized->Initialized
 mod_TooManyItems{1.6.4 2013-09-20} [mod_TooManyItems] (TooManyItems2013_09_20_1.6.4.zip) Unloaded->Constructed->Pre-initialized
 Backpack{1.28.37} [Backpack] (backpack-1.28.37-1.6.x.jar) Unloaded->Constructed->Pre-initialized
 Hats{2.1.4} [Hats] (iChuns-Hats-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized
 TConstruct Environment: Sane and ready for action. Bugs may be reported.
 Profiler Position: N/A (disabled)
 Is Modded: Definitely; Server brand changed to 'fml,forge'
 Type: Dedicated Server (map_server.txt)