I am having issues with the sitemaps and submitting them using Google Webmaster. The "page-sitemap.xml" produces this as output "This XML file does not appear to have any style information associated with it. The document tree is shown below." When submitted to Google I am getting "Your Sitemap does not appear to be in a supported format." I also have W3 Total Cache installed as this is something that was suggested in a few posts. Any help in getting this resolved is greatly appreciated.