Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in /media/jean/learning/huagai/drupal/vendor/symfony/http-kernel/DataCollector/DumpDataCollector.php:32 Stack trace: #0 {main} thrown in /media/jean/learning/huagai/drupal/vendor/symfony/http-kernel/DataCollector/DumpDataCollector.php on line 32