Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Part\AbstractMultipartPart' not found in C:\xampp73\htdocs\web\vendor\symfony\mime\Part\Multipart\RelatedPart.php:20 Stack trace: #0 {main} thrown in C:\xampp73\htdocs\web\vendor\symfony\mime\Part\Multipart\RelatedPart.php on line 20