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