I tried to search and did not easily find this error. I used the plugin to generate a sitemap but it does not seem to be recognized. I tried to reset settings and regenerate a map as suggested in other entries.
GOOGLE gave me this error when I submitted my URL:
General HTTP error: 404 not found
We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit.
My site map was generated and given the following URL: http://www.whatboundariestravel.com/blog/sitemap.xml
Thanks for the help!