[Plugin: WordPress SEO by Yoast] XMl Sitemap Page Showing Blank

I am already using the latest version of Yoast SEO plugin but XML sitemap page was showing blank and there is no xml link showing. How should i get back the page.. here is my domain – http://www.redfoxmagazine.com .. please help

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