I checked the content and it looks solid, no unclosed divs etc., at least not on the portfolio page I checked where the error is shown. From my research, I see that in most cases, this error occurs when your .htaccess file in the root folder is configured incorrectly. The error should resolve itself on the new installation. I can give a try at resolving this for you if you send me a temporary login to the WordPress dashboard, along with a temporary FTP access to this site so that I can debug this for you. You may also email me the same (see bottom right box in my profile page). Thanks