Fatal error: Uncaught Error: Interface 'AC\RequestAjaxHandler' not found in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\classes\RequestHandler\Ajax\ColumnWidthUser.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\classes\RequestHandler\Ajax\ColumnWidthUser.php on line 14