404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A//www.agentesforestales.org/index.php?format=feed&type=rss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A//www.agentesforestales.org/index.php?format=feed&type=rss