Fatal Exception: android.view.WindowManager$BadTokenException Unable to add window -- token null is not valid; is your activity running?

[rahulapatil]

Version-1.1.0

android.view.ViewRootImpl.setView (ViewRootImpl.java:589)
android.view.WindowManagerGlobal.addView (WindowManagerGlobal.java:310)
android.view.WindowManagerImpl.addView (WindowManagerImpl.java:86)
android.widget.PopupWindow.invokePopup (PopupWindow.java:1258)
android.widget.PopupWindow.showAtLocation (PopupWindow.java:1032)
android.widget.PopupWindow.showAtLocation (PopupWindow.java:995)
com.shasin.notificationbanner.Banner$2.run (Banner.java:322)
android.os.Handler.handleCallback (Handler.java:742)
android.os.Handler.dispatchMessage (Handler.java:95)
android.os.Looper.loop (Looper.java:157)
android.app.ActivityThread.main (ActivityThread.java:5603)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:774)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:652)