Fatal error: Uncaught Error: Interface 'AC\Registerable' not found in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\metabox\classes\Service\QuickAdd.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\metabox\classes\Service\QuickAdd.php on line 8