Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\mailer\DataCollector\MessageDataCollector.php:23 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\mailer\DataCollector\MessageDataCollector.php on line 23