以下のエラーログの意味を教えてください。

wordpress3.6でさくら→sixcoreに移転済です。

Unknown column 't.term_order' in 'order clause' for query SELECT t.*, tt.* FROM wp_15_terms AS t INNER JOIN wp_15_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy IN ('link_category') AND tt.count > 0 ORDER BY t.term_order ASC made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/staffblog/single.php'), get_sidebar, locate_template, load_template, require_once('/themes/staffblog/sidebar-left.php'), wp_list_bookmarks, get_terms, referer: http://www.ABC.com/