Fatal error: Uncaught Error: Class "Symfony\Component\HttpClient\Chunk\DataChunk" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-client\Chunk\ServerSentEvent.php:20 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-client\Chunk\ServerSentEvent.php on line 20