Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Header\AbstractHeader" not found in C:\xampp\htdocs\pruebas\v2\ITManager\vendor\symfony\mime\Header\UnstructuredHeader.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\pruebas\v2\ITManager\vendor\symfony\mime\Header\UnstructuredHeader.php on line 19