URL feed

madlyposh.com

I’m trying to install a plug-in app to make a Facebook store. The app support said the URL feed for my site isn’t working. How do I fix this? When I search for the URL feed, the message below reads:

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:sy="http://purl.org/rss/1.0/modules/syndication/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" version="2.0">
<channel>
<title>Madly Posh » Page not found</title>
<atom:link href="http://madlyposh.com/feed" rel="self" type="application/rss+xml"/>
<link>http://madlyposh.com</link>
<description>O N L I N E ◦ F A S H I O N ◦ S T O R E</description>
<lastBuildDate>Wed, 24 Jul 2013 23:52:35 +0000</lastBuildDate>
<language>en-US</language>
<sy:updatePeriod>hourly</sy:updatePeriod>
<sy:updateFrequency>1</sy:updateFrequency>
<generator>http://wordpress.org/?v=3.5.2</generator>
</channel>
</rss>