Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: com.jiraiyah.morepistons.MorePistons
	at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:502)
	at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
	at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:313)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:117)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: com.jiraiyah.morepistons.MorePistons
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:58)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:420)
	at sun.reflect.GeneratedMethodAccessor4.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)
	... 5 more
Caused by: java.lang.NullPointerException
	at org.objectweb.asm.ClassReader.<init>(Unknown Source)
	at cpw.mods.fml.common.asm.transformers.TerminalTransformer.transform(TerminalTransformer.java:14)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174)
	... 32 more