Structured Data errors in Google Webmaster Tools with this theme

That error is triggered by WordPress core’s function post_class() that prints the hentry class on static pages that don’t display author and date information. The only solution from the theme’s perspective is to display such information on static pages which is rarely desired. Printing this information and then hiding it is not a good idea since there’s a higher chance to get penalized by Google for hiding content than for structured data errors.