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java.lang.NullPointerException: Rendering screen	at com.arisux.airi.Updater$1.drawWindowContents(Updater.java:141)	at com.arisux.airi.lib.render.windowapi.themes.Theme.drawContents(Theme.java:49)	at com.arisux.airi.lib.render.windowapi.themes.Theme.drawWindow(Theme.java:26)	at com.arisux.airi.lib.render.windowapi.themes.ThemeDefault.drawWindow(ThemeDefault.java:17)	at com.arisux.airi.lib.windowapi.WindowAPI.drawWindow(WindowAPI.java:54)	at com.arisux.airi.lib.windowapi.WindowManager.func_73863_a(WindowManager.java:168)	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1001)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)	at net.minecraft.client.main.Main.main(SourceFile:148)	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)