Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Crypto\SMime" not found in D:\Apache24\www\qilu\back-end\vendor\symfony\mime\Crypto\SMimeEncrypter.php:20 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu\back-end\vendor\symfony\mime\Crypto\SMimeEncrypter.php on line 20