Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher" not found in D:\Application\www\E-Tracking\vendor\symfony\http-kernel\Tests\Fixtures\TestEventDispatcher.php:16 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\vendor\symfony\http-kernel\Tests\Fixtures\TestEventDispatcher.php on line 16