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