Fatal error: Uncaught Error: Call to undefined function add_action() in /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php:22 Stack trace: #0 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php(18): Xoo_Wl_Core->hooks() #1 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php(12): Xoo_Wl_Core->__construct() #2 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php(218): Xoo_Wl_Core::get_instance() #3 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php(220): xoo_wl_core() #4 {main} thrown in /home/haamidan/hdskala.org/seo/waitlist-woocommerce/includes/class-xoo-wl-core.php on line 22