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Unexpected error
java.lang.NullPointerException: Unexpected error	at net.minecraft.util.BlockPos.func_177967_a(BlockPos.java:131)	at net.minecraft.util.BlockPos.func_177972_a(BlockPos.java:126)	at romelo333.notenoughwands.Items.BuildingWand.findSuitableBlocks(BuildingWand.java:302)	at romelo333.notenoughwands.Items.BuildingWand.findSuitableBlocks(BuildingWand.java:271)	at romelo333.notenoughwands.Items.BuildingWand.renderOverlay(BuildingWand.java:259)	at romelo333.notenoughwands.proxy.ClientProxy.renderWorldLastEvent(ClientProxy.java:45)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_541_ClientProxy_renderWorldLastEvent_RenderWorldLastEvent.invoke(.dynamic)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49)	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)	at net.minecraftforge.client.ForgeHooksClient.dispatchRenderLast(ForgeHooksClient.java:123)	at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1407)	at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1230)	at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1058)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1051)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)	at net.minecraft.client.main.Main.main(SourceFile:124)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)