The "mailer" system does not exist. code 500

## wa-system/waSystem.class.php(105)
#0 wa-system/waSystem.class.php(1528): waSystem::getInstance('mailer', NULL, 1)
#1 wa-system/controller/waDispatch.class.php(348): wa('mailer', 1)
#2 wa-system/controller/waDispatch.class.php(34): waDispatch->dispatchFrontend('mailer/my/')
#3 wa-system/waSystem.class.php(614): waDispatch->dispatch()
#4 index.php(7): waSystem->dispatch()
#5 {main}

GET

[]

Params

[
  'app' => 'mailer',
  'private' => true,
  'theme' => 'insales',
  'theme_mobile' => 'insales',
]