Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Test\AbstractTransportFactoryTestCase" not found in /var/www/html/vendor/symfony/mailer/Test/TransportFactoryTestCase.php:26 Stack trace: #0 {main} thrown in /var/www/html/vendor/symfony/mailer/Test/TransportFactoryTestCase.php on line 26