RSS Error: WP HTTP Error: cURL error 60: SSL certificate problem: certificate has expired

RSS Error: A feed could not be found at http://www.premiere.fr/var/premiere/storage/rss/sorties_semaine_films.xml. A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed.