Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Encoder\Base64Encoder' not found in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Encoder/Base64MimeHeaderEncoder.php:19 Stack trace: #0 {main} thrown in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Encoder/Base64MimeHeaderEncoder.php on line 19