404. That’s an error.
The requested URL /add?feedurl=http%3A%2F%2Ffr.arkadia.com%2Fimmobilier%2Fentreprise%2Fvente%2Ffrance%2Florraine%2Fmeurthe-et-moselle%2Fnancy%2Frss%2F%3Fak__currency_code%3DEUR%26ak__measurementsystem%3D1
was not found on this server. That’s all we know.