Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /srv/users/serverpilot/apps/mindful-wordpress/public/wp-content/plugins/greeting-card/lib/design/interface.php:39 Stack trace: #0 /srv/users/serverpilot/apps/mindful-wordpress/public/wp-content/plugins/greeting-card/lib/design/index.php(4): require_once() #1 {main} thrown in /srv/users/serverpilot/apps/mindful-wordpress/public/wp-content/plugins/greeting-card/lib/design/interface.php on line 39