Fatal error: Uncaught Error: Class 'Swift_Preferences' not found in C:\xampp\htdocs\print-bk\vendor\swiftmailer\swiftmailer\lib\preferences.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\swiftmailer\swiftmailer\lib\preferences.php on line 9