Pull RSS Feeds From Facebook Page

I need help to pull RSS feeds from a facebook page I'm using the following code but it keeps giving me an error :

string url = "https://www.facebook.com/feeds/page.php?id=40796308305&format=rss20";XmlReaderSettings settings =     new XmlReaderSettings                    {                         XmlResolver = null,                         DtdProcessing=DtdProcessing.Parse,                     }; XmlReader reader = XmlReader.Create(url,settings);SyndicationFeed feed = SyndicationFeed.Load(reader);foreach (var item in feed.Items){    Console.WriteLine(item.Id);    Console.WriteLine(item.Title.Text);    Console.WriteLine(item.Summary.Text);}if (reader != null) reader.Close();

This code works perfectly with any blog or page rss but with Facebook rss it give an exception with the following message

The element with name 'html' and namespace 'http://www.w3.org/1999/xhtml' is not an allowed feed format.

Thanks