Fatal error: Uncaught Error: Call to undefined function add_action() in /home/america2/public_html/wp-content/plugins/klaviyo/includes/admin/class-kl-plugins-screen-updates.php:39 Stack trace: #0 /home/america2/public_html/wp-content/plugins/klaviyo/includes/admin/class-kl-plugins-screen-updates.php(70): KL_Plugins_Screen_Updates->__construct() #1 {main} thrown in /home/america2/public_html/wp-content/plugins/klaviyo/includes/admin/class-kl-plugins-screen-updates.php on line 39