AngularJS has built-in support for dependency injection: components can simply list the names of the services they depend on, and AngularJS will provide appropriate instances and pass them as arguments at runtime.

Each injected service has a kind, this kind influences which components the service is compatible with.

Ensure that declared dependencies have the right kind for the component they are injected into.

The following example shows a config-method that lists a dependency on a service named year. Later, a service of kind value is defined with the name year. This is not allowed, since config-methods can only be injected with services of kind provider or constant.

To solve this problem, the year service has to be of kind constant.

AngularJS Developer Guide: Dependency Injection.