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java.lang.NullPointerException: Ticking entity	at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:242)	at net.minecraft.world.gen.structure.MapGenStructure.func_75048_a(MapGenStructure.java:104)	at twilightforest.world.ChunkProviderTwilightForest.isBlockInStructureBB(ChunkProviderTwilightForest.java:1066)	at twilightforest.TFEventListener.livingAttack(TFEventListener.java:925)	at cpw.mods.fml.common.eventhandler.ASMEventHandler_782_TFEventListener_livingAttack_LivingAttackEvent.invoke(.dynamic)	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)	at net.minecraftforge.common.ForgeHooks.onLivingAttack(ForgeHooks.java:292)	at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:737)	at net.minecraft.entity.monster.EntityMob.func_70097_a(SourceFile:54)	at matteroverdrive.entity.weapon.PlasmaBolt.func_70071_h_(PlasmaBolt.java:249)	at net.minecraft.world.World.func_72866_a(World.java:2070)	at net.minecraft.world.World.func_72870_g(World.java:2034)	at net.minecraft.world.World.func_72939_s(World.java:1887)	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2006)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)	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)