@ngdoc error
@name $controller:ctrlreg
@fullName A controller with this name is not registered.
@description

This error occurs when the {@link ng.$controller `$controller()`} service is called
with a string that does not match any of the registered controllers. The controller service may have
been invoked directly, or indirectly, for example through the {@link ng.ngController `ngController`} directive,
or inside a {@link angular.Module#component component} / {@link angular.Module#directive directive} /
{@link ngRoute.$routeProvider#when route} definition (when using a string for the controller property).
Third-party modules can also instantiate controllers with the {@link ng.$controller `$controller()`} service.

Causes for this error can be:

1. Your reference to the controller has a typo. For example, in
the {@link ng.ngController `ngController`} directive attribute, in a {@link angular.Module#component component}
definition's controller property, or in the call to {@link ng.$controller `$controller()`}.
2. You have not registered the controller (neither via {@link angular.Module#controller `Module.controller`}
nor {@link ng.$controllerProvider#register `$controllerProvider.register()`}.
3. You have a typo in the *registered* controller name.


Please consult the {@link ng.$controller $controller} service api docs to learn more.