Fatal error: Uncaught Error: Call to undefined function add_action() in /usr/local/www/wordpress/wp-content/plugins/jetpack/modules/widgets/migrate-to-core/gallery-widget.php:221 Stack trace: #0 {main} thrown in /usr/local/www/wordpress/wp-content/plugins/jetpack/modules/widgets/migrate-to-core/gallery-widget.php on line 221