404. That’s an error.
The requested URL /add?feedurl=http://www.sectors.gen.tr/insaat/tas_firin_yapimi/kurtulus_tasfirin/firma.rss was not found on this server. That’s all we know.
/add?feedurl=http://www.sectors.gen.tr/insaat/tas_firin_yapimi/kurtulus_tasfirin/firma.rss