Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /app/vendor/rackspace/php-opencloud/lib/OpenCloud/Common/Http/Message/RequestSubscriber.php:25 Stack trace: #0 {main} thrown in /app/vendor/rackspace/php-opencloud/lib/OpenCloud/Common/Http/Message/RequestSubscriber.php on line 25