Notice: Use of undefined constant SHIFTNAV_EXTENDED - assumed 'SHIFTNAV_EXTENDED' in /var/www/html/wp-content/plugins/shiftnav-pro/pro/admin/settings.pro.php on line 6

Fatal error: Call to undefined function add_action() in /var/www/html/wp-content/plugins/shiftnav-pro/pro/admin/settings.pro.php on line 12