Fatal error: Uncaught Error: Call to undefined function add_action() in /home/america2/public_html/wp-content/plugins/pdf-invoices-and-packing-slips-for-woocommerce-pro/includes/apifw-cron.php:7 Stack trace: #0 {main} thrown in /home/america2/public_html/wp-content/plugins/pdf-invoices-and-packing-slips-for-woocommerce-pro/includes/apifw-cron.php on line 7