android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

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Unable to add window -- token null is not for an application
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application	at android.view.ViewRootImpl.setView(ViewRootImpl.java:853)	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:337)	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)	at android.app.Dialog.show(Dialog.java:350)	at android.app.AlertDialog$Builder.show(AlertDialog.java:1113)