Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Encoder\Base64Encoder' not found in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Encoder/Base64ContentEncoder.php:21 Stack trace: #0 {main} thrown in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Encoder/Base64ContentEncoder.php on line 21