Fatal error: Uncaught Error: Call to undefined function WishListMember\Features\add_action() in /home/stor2162/public_html/wp-content/plugins/wishlist-member/features/sequential-upgrade/class-sequential-upgrade.php:23 Stack trace: #0 /home/stor2162/public_html/wp-content/plugins/wishlist-member/features/sequential-upgrade/main.php(11): WishListMember\Features\Sequential_Upgrade->__construct() #1 {main} thrown in /home/stor2162/public_html/wp-content/plugins/wishlist-member/features/sequential-upgrade/class-sequential-upgrade.php on line 23