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Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
    at cpw.mods.fml.common.LoadController.transition(LoadController.java:142)
    at cpw.mods.fml.common.Loader.initializeMods(Loader.java:690)
    at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:93)
    at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:357)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:140)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:429)
    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
    at mods.senitielsSpaceMarineModCode.SenitielsSpaceMarineMod.createBlocks(SenitielsSpaceMarineMod.java:122)
    at mods.senitielsSpaceMarineModCode.SenitielsSpaceMarineMod.load(SenitielsSpaceMarineMod.java:263)
    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:515)
    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.initializeMods(Loader.java:689)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 32 more
Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/Minecraft for invalid side SERVER
    at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:292)
    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:199)
    ... 34 more