Fatal error: Uncaught Error: Class "Monolog\Handler\MailHandler" not found in /var/www/html/testy/example-app/vendor/monolog/monolog/src/Monolog/Handler/SymfonyMailerHandler.php:30 Stack trace: #0 {main} thrown in /var/www/html/testy/example-app/vendor/monolog/monolog/src/Monolog/Handler/SymfonyMailerHandler.php on line 30