Fatal error: Uncaught Error: Call to undefined function add_action() in /home/ola/public_html/wp-content/plugins/radiantthemes-mega-menu/lib/setting.php:5 Stack trace: #0 /home/ola/public_html/wp-content/plugins/radiantthemes-mega-menu/lib/setting.php(72): RT_Megamenu_Setting->__construct() #1 {main} thrown in /home/ola/public_html/wp-content/plugins/radiantthemes-mega-menu/lib/setting.php on line 5