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java.lang.NullPointerException: Updating screen events	at mrriegel.storagenetwork.gui.cable.GuiCable.func_73864_a(GuiCable.java:177)	at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:548)	at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:517)	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1700)	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(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)