Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/handllu1/public_html/redboys/plugins/simple-membership/classes/class.swpm-woocommerce-protection.php:22 Stack trace: #0 /home/handllu1/public_html/redboys/plugins/simple-membership/classes/class.swpm-woocommerce-protection.php(14): SwpmWooCommerceProtection->protect_in_classic_theme() #1 /home/handllu1/public_html/redboys/plugins/simple-membership/classes/class.swpm-woocommerce-protection.php(6): SwpmWooCommerceProtection->protect_wc_single_page() #2 /home/handllu1/public_html/redboys/plugins/simple-membership/classes/class.swpm-woocommerce-protection.php(131): SwpmWooCommerceProtection->__construct() #3 {main} thrown in /home/handllu1/public_html/redboys/plugins/simple-membership/classes/class.swpm-woocommerce-protection.php on line 22