Fatal error: Uncaught Error: Call to undefined function add_action() in /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php:21 Stack trace: #0 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php(16): Xoo_Wl_Table_Core->hooks() #1 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php(9): Xoo_Wl_Table_Core->__construct() #2 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php(123): Xoo_Wl_Table_Core::get_instance() #3 /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php(125): xoo_wl_table_core() #4 {main} thrown in /home/haamidan/hdskala.org/seo/waitlist-woocommerce/admin/class-xoo-wl-table-core.php on line 21