wordpress seo by yoast: xml sitemap not working. Error code: 805303f4

I’ve had my website up and running for a few months now and just figured that my xml sitemap was working, but apparently it isn’t. I’m using wordpress seo by Yoast and when I click to view the xml sitemap it comes up with this.

http://www.elkforge.com/sitemap_index.xml

Error loading stylesheet: An unknown error has occurred (805303f4)

http://site.elkforge.com/wp-content/plugins/wordpress-seo/css/xml-sitemap-xsl.php

I have no clue on how to fix this, and doing a quick search gives tons of different answers (some of them contradictory).
Just an FYI, my wordpress address is actually installed at http://www.site.elkforge.com, but the website it as http://www.elkforge.com.
don’t know if that will affect how the sitemap is written.

Please help if anyone can!
Thanks!!!