Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Header\AbstractHeader' not found in /home/flexinettek/public_html/vendor/symfony/mime/Header/MailboxListHeader.php:25
Stack trace:
#0 {main}
thrown in /home/flexinettek/public_html/vendor/symfony/mime/Header/MailboxListHeader.php on line 25