angular.js/docs/content/error/$injector/cdep.ngdoc

@ngdoc error
@name $injector:cdep
@fullName Circular Dependency
@description

This error occurs when the {@link angular.injector $injector} tries to get
a service that depends on itself, either directly or indirectly. To fix this,
construct your dependency chain such that there are no circular dependencies.

For example:

```
angular.module('myApp', [])
  .factory('myService', function (myService) {
    // ...
  })
  .controller('MyCtrl', function ($scope, myService) {
    // ...
  });
```

When an instance of `MyCtrl` is created, the service `myService` will be created
by the `$injector`. `myService` depends on itself, which causes the `$injector`
to detect a circular dependency and throw the error.

For more information, see the {@link guide/di Dependency Injection Guide}.