Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Header\AbstractHeader' not found in /home/wwseve/public_html/amostra/vendor/symfony/mime/Header/UnstructuredHeader.php:19 Stack trace: #0 {main} thrown in /home/wwseve/public_html/amostra/vendor/symfony/mime/Header/UnstructuredHeader.php on line 19