Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/woo-includes/woo-functions.php:57 Stack trace: #0 {main} thrown in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/woo-includes/woo-functions.php on line 57