I'm receiving the following errors in Google's Structured Data Testing Tool:It seems like the page for the category galeria does not contain these fields. There are also some more errors like this (all with categories links). The strange thing is that the first category doesn't show those errors.Anyway, I added the entry-title fields:<section class=content>    <div class=page-title pad group>        <h1 class=entry-title><i class=fa fa-folder-open></i>Categora <span>Biologa</span></h1>    </div>    ...</section>but the error is still there.Also, author and update doesn't seem to make sense here (categories), so should those messages be ignored?Update:Here is a link to Google's Structured Data Testing Tool for the page to demonstrate this, and to view the HTML code by clicking on the HTML tab. 
Rich snippet errors in Google's Structured Data Testing Tool for category pages
rich snippets;google rich snippets tool
The errors were not due to the categories or tag pages, but to the slider and the sidebar posts in home page. So to solve it I just had to add rich snippets to all the posts shown there (also in categories and tags pages).