Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Encoder\QpEncoder' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\mime\Encoder\QpMimeHeaderEncoder.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\mime\Encoder\QpMimeHeaderEncoder.php on line 17