Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:30 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php on line 30