2013-05-19 15:02:33 [SEVERE] [Minecraft-Server] Encountered an unexpected exception NoClassDefFoundError
java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/CallableMPL2
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:425)
        at sun.reflect.GeneratedMethodAccessor2.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: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.propogateStateMessage(LoadController.java:165)
        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: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:98)
        at cpw.mods.fml.common.Loader.loadMods(Loader.java:503)
        at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:85)
        at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:350)
        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:69)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:429)
        at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.CallableMPL2
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 28 more
Caused by: java.lang.NullPointerException
        at org.objectweb.asm.ClassReader.<init>(Unknown Source)
        at codechicken.core.asm.ASMHelper.createClassNode(ASMHelper.java:105)
        at codechicken.core.asm.ClassHeirachyManager.transform(ClassHeirachyManager.java:90)
        at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:352)
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:225)
        ... 30 more