Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /home/muzsanor/public_html/wp-includes/rest-api/endpoints/class-wp-rest-controller.php:17 Stack trace: #0 /home/muzsanor/public_html/wp-settings.php(255): require() #1 /home/muzsanor/public_html/wp-config.php(89): require_once('/home/muzsanor/...') #2 /home/muzsanor/public_html/wp-load.php(50): require_once('/home/muzsanor/...') #3 /home/muzsanor/public_html/wp-blog-header.php(13): require_once('/home/muzsanor/...') #4 /home/muzsanor/public_html/index.php(17): require('/home/muzsanor/...') #5 {main} thrown in /home/muzsanor/public_html/wp-includes/rest-api/endpoints/class-wp-rest-controller.php on line 17