Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\event-dispatcher\Debug\TraceableEventDispatcher.php:31 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\event-dispatcher\Debug\TraceableEventDispatcher.php on line 31