Unable to add window -- token android.os.BinderProxy@1856e19f is not valid; is your activity running

Hi,
I am getting the following exception in my android activity :

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@1856e19f is not valid; is your activity running?
       at android.view.ViewRootImpl.setView(ViewRootImpl.java:579)
       at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:272)
       at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3071)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2393)
       at android.app.ActivityThread.access$800(ActivityThread.java:148)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5312)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

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Please help what could be the reason for this.

Thanks