Fatal error: Uncaught Error: Call to undefined function add_action() in /home/pac84520/public_html/wp-content/plugins/wp-lister-ebay/classes/integration/WooOrderMetaBox.php:18 Stack trace: #0 /home/pac84520/public_html/wp-content/plugins/wp-lister-ebay/classes/integration/WooOrderMetaBox.php(772): WpLister_Order_MetaBox->__construct() #1 {main} thrown in /home/pac84520/public_html/wp-content/plugins/wp-lister-ebay/classes/integration/WooOrderMetaBox.php on line 18