Fatal error: Uncaught Error: Class 'Swift_Mime_Headers_AbstractHeader' not found in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/IdentificationHeader.php:19 Stack trace: #0 {main} thrown in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/IdentificationHeader.php on line 19