Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Header\AbstractHeader' not found in /var/www/html/btest1.ledaco.net/public_html/external/vendor/symfony/mime/Header/UnstructuredHeader.php:19 Stack trace: #0 {main} thrown in /var/www/html/btest1.ledaco.net/public_html/external/vendor/symfony/mime/Header/UnstructuredHeader.php on line 19