Fatal error: Uncaught Error: Interface "App\Contracts\Billing\InvoiceItemInterface" not found in C:\laragon\www\clientxcms\app\Billing\Items\ConfigOptionServiceInvoiceItem.php:9 Stack trace: #0 {main} thrown in C:\laragon\www\clientxcms\app\Billing\Items\ConfigOptionServiceInvoiceItem.php on line 9