Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Transport\AbstractTransport" not found in D:\xampp\htdocs\bkash-control-panel\v-1.0\vendor\symfony\mailer\Transport\NullTransport.php:21 Stack trace: #0 {main} thrown in D:\xampp\htdocs\bkash-control-panel\v-1.0\vendor\symfony\mailer\Transport\NullTransport.php on line 21