Your Sitemap does not appear to be in a supported format. Please ensure it meets our Sitemap guidelines and resubmit.
The above error occurs when I submit MyURL.com/sitempa.xml to Google Webmaster Tools.
1) Why is that?
2) How can I edit the xml sitemap
3) How can I add custom (non WP) URLs to the sitemap
I am using WP Multisite. Support Access granted