Fatal error: Uncaught Error: Interface "GuzzleHttp\Event\EmitterInterface" not found in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/Event/Emitter.php:19 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/guzzlehttp/guzzle/src/Event/Emitter.php on line 19