Fatal error: Uncaught Error: Class "Symfony\Component\HttpClient\Chunk\DataChunk" not found in /home/zdpktgd/ptc/vendor.old/symfony/http-client/Chunk/ServerSentEvent.php:21 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/http-client/Chunk/ServerSentEvent.php on line 21