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java.lang.NullPointerException: 	at mceshopaddon.item.ItemBlockShop.func_77667_c(ItemBlockShop.java:44)	at net.minecraft.item.Item.func_77657_g(Item.java:469)	at net.minecraft.item.Item.func_77628_j(Item.java:616)	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:559)	at net.minecraftforge.client.GuiIngameForge.renderToolHightlight(GuiIngameForge.java:568)	at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:154)	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1082)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)	at net.minecraft.client.main.Main.main(SourceFile:101)	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:131)	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)