Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Transport\AbstractTransport" not found in /home/tubu/public_html/Drupal_CMS/cms/vendor/symfony/mailer/Transport/AbstractHttpTransport.php:25 Stack trace: #0 {main} thrown in /home/tubu/public_html/Drupal_CMS/cms/vendor/symfony/mailer/Transport/AbstractHttpTransport.php on line 25