Fatal error: Uncaught Error: Interface 'AC\Admin\RequestHandlerInterface' not found in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\admin-columns\classes\Admin\PageRequestHandler.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\admin-columns\classes\Admin\PageRequestHandler.php on line 7