All my sitemaps created by WordPress SEO are now getting the following message:
Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead.
I've looked as much as I can on these, I'm rather confused why after all these months, only the WordPress SEO sitemaps are getting this error.
I also use xml sitemap generator and it's fine...plus I created sitemaps from A-1 Sitemap Generator to compare and all those are fine in Google Webmaster Tools.
Has anyone else had this issue, and is there a way to resolve besides just deleting all the WordPress SEO sitemap and going back to the other ones?