Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /home/adminhj/public_html/blog/wp-content/plugins/ithemes-sync/src/REST/Auth.php:20 Stack trace: #0 {main} thrown in /home/adminhj/public_html/blog/wp-content/plugins/ithemes-sync/src/REST/Auth.php on line 20