Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Envelope" not found in /home/defenders/public_html/projects/clinic_hov_website/vendor/symfony/mailer/DelayedEnvelope.php:24 Stack trace: #0 {main} thrown in /home/defenders/public_html/projects/clinic_hov_website/vendor/symfony/mailer/DelayedEnvelope.php on line 24