java.lang.NoClassDefFoundError: gnu/trove/map/hash/TByteObjectHashMap

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Minecraft continously crashes!

gnu/trove/map/hash/TByteObjectHashMap

java.lang.NullPointerException: 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.(FMLIndexedMessageToMessageCodec.java:19)	at cpw.mods.fml.common.network.internal.FMLRuntimeCodec.(FMLRuntimeCodec.java:13)	at cpw.mods.fml.common.network.internal.FMLNetworkHandler.registerChannel(FMLNetworkHandler.java:163)	at cpw.mods.fml.common.FMLContainer.modConstruction(FMLContainer.java:84)	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.EventSubscriber.handleEvent(EventSubscriber.java:74)	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)	at com.google.common.eventbus.EventBus.post(EventBus.java:275)	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.EventSubscriber.handleEvent(EventSubscriber.java:74)	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)	at com.google.common.eventbus.EventBus.post(EventBus.java:275)	at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)	at cpw.mods.fml.common.Loader.loadMods(Loader.java:492)	at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:204)	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)	at net.minecraft.client.main.Main.main(SourceFile:148)	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 net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)