Fatal error: Uncaught Error: Call to undefined function add_filter() in /usr/local/www/wordpress/wp-content/plugins/.old/woocommerce/includes/react-admin/connect-existing-pages.php:125 Stack trace: #0 {main} thrown in /usr/local/www/wordpress/wp-content/plugins/.old/woocommerce/includes/react-admin/connect-existing-pages.php on line 125