Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /home/.sites/162/site1406375/web/LIVE/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php:17
Stack trace:
#0 {main}
  thrown in /home/.sites/162/site1406375/web/LIVE/wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php on line 17