Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in D:\Application\www\Training\vendor\symfony\http-kernel\DataCollector\RequestDataCollector.php:27 Stack trace: #0 {main} thrown in D:\Application\www\Training\vendor\symfony\http-kernel\DataCollector\RequestDataCollector.php on line 27