Fatal error: Uncaught Error: Interface "Nexmo\Client\Credentials\CredentialsInterface" not found in D:\Application\www\E-Tracking\vendor\nexmo\client\src\Client\Credentials\AbstractCredentials.php:11 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\vendor\nexmo\client\src\Client\Credentials\AbstractCredentials.php on line 11