Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/classes/gateways/class-wc-subscriptions-payment-gateways.php:22 Stack trace: #0 /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/classes/gateways/class-wc-subscriptions-payment-gateways.php(196): WC_Subscriptions_Payment_Gateways::init() #1 {main} thrown in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/classes/gateways/class-wc-subscriptions-payment-gateways.php on line 22