Error message

• Notice: unserialize(): Error at offset 68 of 365 bytes in metatag_metatags_load_multiple() (line 451 of /var/www/vhosts/almarfapearlhotels.com/httpdocs/liwa/sites/all/modules/metatag/metatag.module).
• Notice: Undefined index: submitted in liwa_form_alter() (line 7 of /var/www/vhosts/almarfapearlhotels.com/httpdocs/liwa/sites/all/themes/liwa/template.php).
• Warning: Invalid argument supplied for foreach() in liwa_form_alter() (line 7 of /var/www/vhosts/almarfapearlhotels.com/httpdocs/liwa/sites/all/themes/liwa/template.php).