[Plugin: WordPress SEO by Yoast] Rss Feeds Issue

Hi

Rss feeds is not working for my website http://www.couponsriver.in/feed/

i am using WordPress SEO by Yoast and the Version 1.2.7. i am not using any plugins. can any one help me to resolve this issue.

I would appreciate your help in this regard.

Regards,
Hemanth.

http://wordpress.org/extend/plugins/wordpress-seo/