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java.lang.IllegalStateException: Already building! at net.minecraft.client.renderer.VertexBuffer.func_181668_a(VertexBuffer.java:284) at net.minecraft.client.gui.Gui.func_73729_b(SourceFile:114) at net.minecraft.client.gui.achievement.GuiAchievement.func_146254_a(SourceFile:111) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1099) 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)