Fatal error: Uncaught Error: Interface "Psr\Http\Client\ClientExceptionInterface" not found in /var/www/html/smtp/vendor/guzzlehttp/guzzle/src/Exception/GuzzleException.php:7 Stack trace: #0 {main} thrown in /var/www/html/smtp/vendor/guzzlehttp/guzzle/src/Exception/GuzzleException.php on line 7