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java.lang.NullPointerException: 	at GuiWDLMultiworldSelect.(	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)