Fatal error: Uncaught Error: Interface "App\Domain\Providers\Contracts\ConnectionManagerInterface" not found in C:\xampp\htdocs\smsgateway2\app\Infrastructure\Smpp\SmppConnectionManager.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\smsgateway2\app\Infrastructure\Smpp\SmppConnectionManager.php on line 15