Warning: require_once(Swift/Mime/Attachment.php): failed to open stream: No such file or directory in /var/www/html/efs/ezgcm/lib/Swift-5.1.0/tests/acceptance/Swift/Mime/AttachmentAcceptanceTest.php on line 3

Fatal error: require_once(): Failed opening required 'Swift/Mime/Attachment.php' (include_path='.:/home/ubuntu/.phpbrew/php/php-5.6.40/lib/php/pear') in /var/www/html/efs/ezgcm/lib/Swift-5.1.0/tests/acceptance/Swift/Mime/AttachmentAcceptanceTest.php on line 3