Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /var/www/html/olympiads/wp-content/plugins-tmp-06-2023/gutenberg/lib/experimental/class-wp-rest-navigation-fallback-controller.php:20 Stack trace: #0 {main} thrown in /var/www/html/olympiads/wp-content/plugins-tmp-06-2023/gutenberg/lib/experimental/class-wp-rest-navigation-fallback-controller.php on line 20