Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /home/itscm/dev.its.cm/webserivesits/src/EventSubscriber/TransactionMailSubscriber.php:20 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/src/EventSubscriber/TransactionMailSubscriber.php on line 20