java.lang.IllegalArgumentException: View=DecorView@38d92ca[] not attached to window manager
	at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:485)
	at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:394)
	at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:126)
	at android.app.Dialog.dismissDialog(Dialog.java:397)
	at android.app.Dialog.dismiss(Dialog.java:380)
	at com.entitcs.office_attendance.background_works.c.c(Unknown Source:5)
	at com.entitcs.office_attendance.background_works.c.onPostExecute(Unknown Source:2)
	at android.os.AsyncTask.finish(AsyncTask.java:695)
	at android.os.AsyncTask.-wrap1(Unknown Source:0)
	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:192)
	at android.app.ActivityThread.main(ActivityThread.java:6754)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)