Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Part\DataPart" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\mime\Part\MessagePart.php:22 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\mime\Part\MessagePart.php on line 22