jamessawle on "[Plugin: WordPress SEO by Yoast] XML Sitemap Button gives error"

I get the following error when I select the XML Sitemap, any ideas?

<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="http://www.manxdesigns.com/blog/wp-content/plugins/wordpress-seo/css/xml-sitemap-xsl.php"?>
^

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