java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference
	at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:224)
	at android.app.AlertDialog.<init>(AlertDialog.java:201)
	at android.app.AlertDialog.<init>(AlertDialog.java:197)
	at android.app.AlertDialog.<init>(AlertDialog.java:142)
	at android.app.ProgressDialog.<init>(ProgressDialog.java:94)
	at android.app.ProgressDialog.show(ProgressDialog.java:179)
	at android.app.ProgressDialog.show(ProgressDialog.java:159)
	at com.entitcs.office_attendance.fragments.Add_Task.setTour(Add_Task.java:1640)
	at com.entitcs.office_attendance.fragments.Add_Task.access$000(Add_Task.java:112)
	at com.entitcs.office_attendance.fragments.Add_Task$16.onClick(Add_Task.java:1509)
	at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:172)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:201)
	at android.app.ActivityThread.main(ActivityThread.java:6820)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:922)