Error when attempting to access Referer

"Miller, Samuel" <[email protected]> Mon, 28 Oct 2013 15:23:45 -0600
Newsgroups gmane.org.w3c.validator.css
Message-ID <B8FF357F301C494998EC22D47E20CFD6042D38E6A8@cccsdna51>
When attempting to access this link, http://jigsaw.w3.org/css-validator/check/referer,  I get a message once the page loads which reads,

"Some Headers, mandatory for this resource, are missing.

 *   Referer"
This is the only thing that show up on the page that loads. I thought you might like to know about this.
Also referrer has 2 Rs: referrer.
Thanks
Sam