Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /Applications/Abyss Web Server/htdocs/modellflygklubbar/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php:19 Stack trace: #0 {main} thrown in /Applications/Abyss Web Server/htdocs/modellflygklubbar/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php on line 19