Fatal error: Uncaught Error: Interface "GuzzleHttp\Event\HasEmitterInterface" not found in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/ClientInterface.php:12 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/ClientInterface.php on line 12