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java.lang.NullPointerException: 	at android.opengl.GLSurfaceView.surfaceCreated(GLSurfaceView.java:523)	at android.view.SurfaceView.updateWindow(SurfaceView.java:572)	at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:232)	at android.view.View.dispatchWindowVisibilityChanged(View.java:8004)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1077)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1233)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)	at android.view.Choreographer.doCallbacks(Choreographer.java:574)	at android.view.Choreographer.doFrame(Choreographer.java:544)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5001)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)	at dalvik.system.NativeStart.main(Native Method)