Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Part\TextPart" not found in D:\Apache24\www\gs1_taizhou\back\vendor\symfony\mime\Part\DataPart.php:20 Stack trace: #0 {main} thrown in D:\Apache24\www\gs1_taizhou\back\vendor\symfony\mime\Part\DataPart.php on line 20