Fatal error: Uncaught Error: Call to undefined function add_action() in /var/www/noteswp.new/wp-content/plugins-backup/netbase_solutions/core/modules/product-notification/inc/frontend.php:4 Stack trace: #0 /var/www/noteswp.new/wp-content/plugins-backup/netbase_solutions/core/modules/product-notification/inc/frontend.php(57): NBT_Notification_Frontend->__construct() #1 {main} thrown in /var/www/noteswp.new/wp-content/plugins-backup/netbase_solutions/core/modules/product-notification/inc/frontend.php on line 4