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java.lang.NullPointerException at GuiWDLMultiworldSelect.<init>( at GuiWDLMultiworld.func_73875_a( at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72) at GuiWDLMultiworld.func_73864_a( at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:127) at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:111) at net.minecraft.client.Minecraft.func_71407_l( at net.minecraft.client.Minecraft.func_71411_J( at at Source)