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Unable to add window -- token null is not valid; is your activity running?
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Unable to add window android.view.ViewRootImpl$W@142544eb -- permission denied for this window type
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Unable to add window -- token null is not for an application
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application	at android.view.ViewRootImpl.setView(ViewRootImpl.java:804)	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:288)	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:73)	at android.app.Dialog.show(Dialog.java:287)	at ir.blog.trafik.BackGround.onPostExecute(BackGround.java:103)	at ir.blog.trafik.BackGround.onPostExecute(BackGround.java:22)	at android.os.AsyncTask.finish(AsyncTask.java:631)	at android.os.AsyncTask.access$600(AsyncTask.java:177)	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:176)	at android.app.ActivityThread.main(ActivityThread.java:5493)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1225)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1041)	at dalvik.system.NativeStart.main(Native Method)