Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Crypto\SMime' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\mime\Crypto\SMimeEncrypter.php:20 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\mime\Crypto\SMimeEncrypter.php on line 20