WordPress SEO not working – contains 0 urls

Yoast WordPress SEO doesn’t work for me as the site map contains 0 urls.

I’m running:

WordPress 3.5.1
DMSGuestbooK 1.1.13 and DMSGuestBook widget 2.5.2
TinyMCE Advanced 3.5.8
WooCommerce 1.6.6
WooCommerce eWay gateway (A) 1.3
WordPress SEO 1.4.3

Any suggestions?

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