Fatal error: Uncaught InvalidArgumentException: The sender, recipient and subject or an email prototype have to be specified to use a SwiftMailerHandler in /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/Builder/ExprBuilder.php:187 Stack trace: #0 /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/Builder/ExprBuilder.php(239): Symfony\Component\Config\Definition\Builder\ExprBuilder->Symfony\Component\Config\Definition\Builder\{closure}(Array) #1 /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/BaseNode.php(461): Symfony\Component\Config\Definition\Builder\ExprBuilder::Symfony\Component\Config\Definition\Builder\{closure}(Array) #2 /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/PrototypedArrayNode.php(177): Symfony\Component\Config\Definition\BaseNode->finalize(Array) #3 /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/BaseNode.php(455): Symfony\Component\Config\De in /opt/webserver/prod/releases/712/htdocs/classes/vendor/symfony/config/Definition/BaseNode.php on line 469