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java.lang.NullPointerException: Ticking screen	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:503)	at refinedstorage.gui.GuiGrid.update(GuiGrid.java:169)	at refinedstorage.gui.GuiBase.func_73876_c(GuiBase.java:74)	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1720)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)	at net.minecraft.client.main.Main.main(SourceFile:124)	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)