I have tried the suggestions above and read the doc I still get a 404 error when clicking on the Sitemap button or entering the complete url. I have no cache plugin or add meta tags plugin. I tied it on two different sites with the same results.
Is there something else to look at?
The only other problem I have seen is the Generate robots.txt file just shows a whole much of “source code” but no editor is shown. I don’t know if it is related. The .htaccess displays ok.
Thanks