Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /home/theinsightpartne/public_html/blog/wp-content/plugins/gutenberg/lib/experimental/class-wp-rest-block-editor-settings-controller.php:14 Stack trace: #0 {main} thrown in /home/theinsightpartne/public_html/blog/wp-content/plugins/gutenberg/lib/experimental/class-wp-rest-block-editor-settings-controller.php on line 14