RSS Error Notice

Hi everyone

When I log into my admin dashboard, I get this error message:

RSS Error: A feed could not be found at
http://blogsearch.google.com/blogsearch_feeds?scoring=d&ie=utf-8&num=10&outp
ut=rss&partner=wordpress&q=link:http://localhost:8080/wordpress/. 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.

Can anybody explain what this means?

Thanks

Mike