Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Crypto\SMime" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\mime\Crypto\SMimeSigner.php:20 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\mime\Crypto\SMimeSigner.php on line 20