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via GitHub by Gamerbolts
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This exception has no message.
java.lang.NullPointerException: 	at com.xcompwiz.mystcraft.inventory.ContainerWritingDesk.(ContainerWritingDesk.java:77)	at com.xcompwiz.mystcraft.inventory.GuiHandler.getServerGuiElement(GuiHandler.java:52)	at cpw.mods.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:243)	at cpw.mods.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:75)	at net.minecraft.entity.player.EntityPlayer.openGui(Unknown Source)	at com.xcompwiz.mystcraft.block.BlockWritingDesk.func_149727_a(BlockWritingDesk.java:151)	at net.minecraft.server.management.ItemInWorldManager.func_73078_a(Unknown Source)	at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)	at fastcraft.at.a(F:978)	at fastcraft.H.aq(F:36)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)