Fatal error: Uncaught Error: Call to undefined function add_action() in /home/globaltourtourds/public_html/wp-content/plugins/wp-travel/app/inc/admin/class-wptravel-admin-assets.php:18 Stack trace: #0 /home/globaltourtourds/public_html/wp-content/plugins/wp-travel/app/inc/admin/class-wptravel-admin-assets.php(125): WpTravel_Admin_Assets::init() #1 {main} thrown in /home/globaltourtourds/public_html/wp-content/plugins/wp-travel/app/inc/admin/class-wptravel-admin-assets.php on line 18