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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 mixac1.dangerrpg.item.gem.Gem.addItemTypes(Gem.java:48)	at mixac1.dangerrpg.init.RPGGems.load(RPGGems.java:29)	at mixac1.dangerrpg.proxy.CommonProxy.preInit(CommonProxy.java:38)	at mixac1.dangerrpg.proxy.ClientProxy.preInit(ClientProxy.java:27)	at mixac1.dangerrpg.DangerRPG.preInit(DangerRPG.java:42)	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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)	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:212)	at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)	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:119)	at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:556)	at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:243)	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)	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)