Fatal error: Uncaught Error: Class 'Doctrine\Common\EventArgs' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\doctrine\orm\lib\Doctrine\ORM\Event\PreFlushEventArgs.php:34 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\doctrine\orm\lib\Doctrine\ORM\Event\PreFlushEventArgs.php on line 34