Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Header\UnstructuredHeader" not found in D:\NTG_App\www\Support_Issue\vendor\symfony\mime\Header\ParameterizedHeader.php:19 Stack trace: #0 {main} thrown in D:\NTG_App\www\Support_Issue\vendor\symfony\mime\Header\ParameterizedHeader.php on line 19