Fatal error: Uncaught Error: Class 'Symfony\Component\Mailer\Transport\AbstractTransport' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\mailer\Transport\SendmailTransport.php:38 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\mailer\Transport\SendmailTransport.php on line 38