If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
Have you checked your site in Google Webmasters? That really is the definitive problem finder. There are many potential errors in most sites that just don't impact on SEO or site function at all. If however you see something in Webmasters that also appears in your other report then you would need to act on the Google Webmasters advice.
Gop is absolutely right Ian, I have 63 errors, as long as your site looks OK in various browsers and everything works there's no need to worry. Most errors are caused by Yola's not so great use of html which the site builder won't allow you to correct anyway.