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Unable to add window -- token android.view.ViewRootImpl$W@40ece840 is not valid; is your activity running?
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?	at android.view.ViewRootImpl.setView(ViewRootImpl.java:678)	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:279)	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)	at android.widget.PopupWindow.invokePopup(PopupWindow.java:1070)	at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:970)	at android.widget.ListPopupWindow.show(ListPopupWindow.java:644)	at android.widget.AutoCompleteTextView.showDropDown(AutoCompleteTextView.java:1114)	at mono.android.text.TextWatcherImplementor.n_afterTextChanged(Native Method)	at mono.android.text.TextWatcherImplementor.afterTextChanged(TextWatcherImplementor.java:33)	at android.widget.TextView.sendAfterTextChanged(TextView.java:7947)	at android.widget.TextView.setText(TextView.java:4084)	at android.widget.TextView.setText(TextView.java:3933)	at android.widget.EditText.setText(EditText.java:91)	at android.widget.TextView.setText(TextView.java:3908)	at android.widget.TextView.onRestoreInstanceState(TextView.java:3808)	at android.view.View.dispatchRestoreInstanceState(View.java:13795)	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3022)	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3022)	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3022)	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3022)	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3022)	at android.view.View.restoreHierarchyState(View.java:13773)	at android.support.v4.app.Fragment.restoreViewState(Fragment.java:465)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1094)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1234)	at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2046)	at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:174)	at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:597)	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1228)	at android.app.Activity.performStart(Activity.java:5987)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2423)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522)	at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4118)	at android.app.ActivityThread.access$900(ActivityThread.java:167)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1423)	at android.os.Handler.dispatchMessage(Handler.java:111)	at android.os.Looper.loop(Looper.java:194)	at android.app.ActivityThread.main(ActivityThread.java:5534)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)