Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Header\UnstructuredHeader" not found in D:\Webserver\Apache24\htdocs\laravel\basic\vendor\symfony\mailer\Header\TagHeader.php:19 Stack trace: #0 {main} thrown in D:\Webserver\Apache24\htdocs\laravel\basic\vendor\symfony\mailer\Header\TagHeader.php on line 19