Feed not detected

I am getting following message in my IndiRank stats ->

There was a problem detecting your feed. When you access your blog using Firefox, click on the rss feed icon in your address bar. Do you see a valid feed? If you need help, do ask around at the forum.

My feed address is http://hckkid.wordpress.com/feed/ . Which is working quite fine. I have been blogging regularly for past month with at least 1 post in 2-3 days. It