Fatal error: Uncaught Error: Class "Symfony\Component\Debug\ExceptionHandler" not found in /var/www/html/phpkobo/research/php-downloaded-apps/phpmailer-5-2-16/PHPMailer-5.2.16/vendor/symfony/debug/Tests/MockExceptionHandler.php:16 Stack trace: #0 {main} thrown in /var/www/html/phpkobo/research/php-downloaded-apps/phpmailer-5-2-16/PHPMailer-5.2.16/vendor/symfony/debug/Tests/MockExceptionHandler.php on line 16