Invalid RSS Feed. Undefined item element: media:backLinks
<p>When I run my rss <a href="http://www.goalscout.com/static/rss2.xml" rel="nofollow noreferrer">http://www.goalscout.com/static/rss2.xml</a> through <a href="http://validator.w3.org/feed/" rel="nofollow noreferrer">http://validator.w3.org/feed/</a> I get the error message</p>

<p><em>This feed does not validate.</em></p>

<pre><code>line 14, column 9: Undefined item element: media:backLinks (2 occurrences) [help]

&lt;media:backLinks&gt;
</code></pre>

<p>So I'm unable to understand what's wrong with this xml. </p>

<p>XML namespace for <code>media</code> it seems be correctly defined, as <a href="http://www.rssboard.org/media-rss" rel="nofollow noreferrer">RSS Advisory Board</a> reccomends, I had googled around for few hours but no one had same problem. </p>

<p>Thanks to anyone who can point me in the right direction.</p>