Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Part\AbstractPart" not found in D:\Apache24\www\qilu_sap\back-end\vendor\symfony\mime\Part\TextPart.php:24 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu_sap\back-end\vendor\symfony\mime\Part\TextPart.php on line 24