Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/pac84520/public_html/wp-content/plugins/woocommerce-ajax-filters/includes/paid/advanced_caching.php:11 Stack trace: #0 /home/pac84520/public_html/wp-content/plugins/woocommerce-ajax-filters/includes/paid/advanced_caching.php(136): BeRocket_AAPF_paid_advanced_caching->__construct() #1 {main} thrown in /home/pac84520/public_html/wp-content/plugins/woocommerce-ajax-filters/includes/paid/advanced_caching.php on line 11