[Plugin: WordPress SEO by Yoast] Sitemap error: document empty

I left a comment on a previously resolved thread, but also wanted to start another.

The sitemap I am trying to create for my site is coming up blank: http://unicornbooty.com/sitemap.xml

Did I do something wrong?

Thanks so much for any help!

[Signature removed by moderator – Don’t do that]

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