Error : Missing required field "updated"

Hello CanaC,

I just finished corrected my site.

I created a file “functions.php” in my child theme with this 2 fonctions (mod content and add hatom data) :

//mod content
function hatom_mod_post_content ($content) {
  if ( in_the_loop() && !is_page() ) {
    $content = '<span class="entry-content">'.$content.'</span>';
  }
  return $content;
}
add_filter( 'the_content', 'hatom_mod_post_content');

//add hatom data
function add_mod_hatom_data($content) {
    $t = get_the_modified_time('F jS, Y');
    $author = get_the_author();
    $title = get_the_title();
    if(is_single()) {
        $content .= '<div class="hatom-extra"><span class="entry-title">'.$title.'</span> was last modified: <span class="updated"> '.$t.'</span> by <span class="author vcard"><span class="fn">'.$author.'</span></span></div>';
    }
    return $content;
    }
add_filter('the_content', 'add_mod_hatom_data');

You can find the detailed solution here :

http://www.davidtiong.com/fix-hatom-microformats-at-least-one-field-must-be-set-for-hatomentry

You can also add the functions directly in the functions.php file of your theme but you could loose your modifications in case of an update of the Mantra theme.

I hope this will help you.

Valérie, France
PS : please excuse my poor English