404. That’s an error.
The requested URL /add?source=atgs&feedurl=feed%3A//www.theresabyrnes.com/studiodiary/%3Ffeed%3Drss2 was not found on this server. That’s all we know.
/add?source=atgs&feedurl=feed%3A//www.theresabyrnes.com/studiodiary/%3Ffeed%3Drss2