I am using wordpress seo and while submitting sitemap to google webmaster I got the message "Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead."
Here is the link to the sitemap page http://www.kidiezone.com/sitemap_index.xml
My permalink structure is /%postname%/
I am not using any caching plugins.
I am using Dean's Permalinks Migration plugin since I changed my permalink structure from /category/postname to /postname/. I deactivated it and checked , but still it was the same.
WordPress seo version 18.104.22.168