Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /home/crossfir/public_html/wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:17
Stack trace:
#0 {main}
thrown in /home/crossfir/public_html/wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php on line 17