Fatal error: Uncaught Error: Class "GuzzleHttp\Event\AbstractEvent" not found in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/Event/AbstractRequestEvent.php:11 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/Event/AbstractRequestEvent.php on line 11