dt125x

When I changed to twentyfourteen it showed placemakers?
What does it mean? Problem is in the theme?
What should I do?

Thanks

Did anyone solve this problem and how ?

Is page_sitemap the only sitemap I should have? Is this a primary sitemap? On some other sitemaps I have this error but on this one i do not… Is it enough to delete all the others and leave page_sitemap.xml ?

* Sitemaps are showing error that they are HTML and that hey should be in different format…