Fatal error: Uncaught Error: Class 'Symfony\Component\Form\FormEvent' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\form\Event\PreSubmitEvent.php:23 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\form\Event\PreSubmitEvent.php on line 23