Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /home10/amoutsei/public_html/wp-content/plugins/gutenberg/lib/experimental/class-wp-rest-block-editor-settings-controller.php:16 Stack trace: #0 {main} thrown in /home10/amoutsei/public_html/wp-content/plugins/gutenberg/lib/experimental/class-wp-rest-block-editor-settings-controller.php on line 16