Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Header\UnstructuredHeader' not found in C:\webserver\data\htdocs\api\vendor\symfony\mime\Header\ParameterizedHeader.php:19 Stack trace: #0 {main} thrown in C:\webserver\data\htdocs\api\vendor\symfony\mime\Header\ParameterizedHeader.php on line 19