These errors are raised by valencia_breadcrumb() on every page:

Notice: Undefined index: links in valencia_breadcrumb() (linea 242 di /home/www/htdocs/sites/all/themes/valencia/template.php).

Warning: Invalid argument supplied for foreach() in valencia_breadcrumb() (linea 242 di /home/www/htdocs/sites/all/themes/valencia/template.php).