Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /nfs/bronfs/uwfs/hw00/d73/eph/wordpress/wp-content/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/gutenberg-available-extensions.php:22 Stack trace: #0 {main} thrown in /nfs/bronfs/uwfs/hw00/d73/eph/wordpress/wp-content/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/gutenberg-available-extensions.php on line 22