[Plugin: WordPress SEO by Yoast] XML Sitemap Erorr 805303f4

I’ve had some similar errors related to stylesheets. The first thing I do when this happens is disable all other plugins. Do that and see if the error continues.

Also, I didn’t read it too closely, but there is another thread on a resolved error similar to this.
http://wordpress.org/support/topic/plugin-wordpress-seo-by-yoast-www-error-805303f4?replies=5