I am currently using SEO by Yoast to make the XML Sitemap. When I go into the URL for my sitemap, I get an error message. How do I fix this so that my sitemap is functioning properly? Is it something in the settings within SEO by Yoast?
My sitemap URL: http://www.dkimgroup.com/sitemap_index.xml
The error message that I see: http://www.dkimgroup.com/post-sitemap.xml