Installed the plugin on WP multisite installation - tried submitting the sitemap for the head site at Google Webmaster and received the following error -
"Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead."
Saw someone else with this error but they never indicated how they fixed it. Site is http://www.costaricacloseup.com
Your help would be appreciated!