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java.lang.NullPointerException at GuiWDLMultiworldSelect.<init>(GuiWDLMultiworldSelect.java:32) at GuiWDLMultiworld.func_73875_a(GuiWDLMultiworld.java:47) at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72) at GuiWDLMultiworld.func_73864_a(GuiWDLMultiworld.java:67) 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(Minecraft.java:1500) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:835) at net.minecraft.client.Minecraft.run(Minecraft.java:760) at java.lang.Thread.run(Unknown Source)