Fatal error: Uncaught Error: Interface 'Vonage\Client\Credentials\CredentialsInterface' not found in C:\xampp\htdocs\kit\vendor\vonage\client-core\src\Client\Credentials\AbstractCredentials.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kit\vendor\vonage\client-core\src\Client\Credentials\AbstractCredentials.php on line 14