Symfony2 Monolog to Email Errors why swiftmailer.transport.real is non-existent service

after updating symfony from `2.3` to `2.4` i got `ServiceNotFoundException` ``` Fatal error: Uncaught exception 'Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException' with message 'The service "monolog.handler.mojhandler" has a dependency on a non-existent service "swiftmailer.transport.real".' in E:\wamp\www\project\vendor\symfony\symfony\src\Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass.php on line 59 ``` here is my config_prod.yml ``` imports: - { resource: config.yml } monolog: handlers: main: type: fingers_crossed action_level: error handler: streamed streamed: type: stream path: %kernel.logs_dir%/%kernel.environment%.log level: debug mail: type: fingers_crossed action_level: error handler: buffered channels: ["!app"] # Dont log app because we dont' want 404 errors sending buffered: type: buffer handler: mojhandler mojhandler: type: swift_mailer from_email: %mojhandler_logger_email% to_email: %mojhandler_logger_email% subject: "[Panel] An Error Occurred!" level: debug ``` and here is my swiftmailer configuration from config.yml ``` # Swiftmailer Configuration swiftmailer: transport: %mailer_transport% host: %mailer_host% username: %mailer_user% password: %mailer_password% port: %mailer_port% auth_mode: %mailer_auth_mode% encryption: %mailer_encryption% ``` how can i fix it?