A plugin to serve WordPress content using the application/xhtml+xml MIME type
That is a problem with Google Adsense which assumes that you will be sending content as
text/html, and it breaks if you send it as
This means that your theme is producing invalid XHTML, and you probably need to contact the theme authors. I find that this is most often caused by using invalid HTML entities in the document.
This means that your DTD and/or XHTML namespace are incorrect. Check to make sure that the DTD is a valid XHTML doctype and that your
html tag contains the XHTML namespace (