Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Transport\Smtp\SmtpTransport" not found in D:\Apache24\www\ys_gs1\back-end\vendor\symfony\mailer\Transport\Smtp\EsmtpTransport.php:28 Stack trace: #0 {main} thrown in D:\Apache24\www\ys_gs1\back-end\vendor\symfony\mailer\Transport\Smtp\EsmtpTransport.php on line 28