Fatal error: Uncaught Error: Class 'Symfony\Component\Mailer\Envelope' not found in D:\workspaces\liZiPingBack\vendor\symfony\mailer\DelayedEnvelope.php:24 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\mailer\DelayedEnvelope.php on line 24