Error when trying to inject a service into an angular component “EXCEPTION: Can't resolve all parameters for component”, why?

Question

I\'ve built a basic app in Angular, but I have encountered a strange issue where I cannot inject a service into one of my components. It injects fine into any of the three o

Answer 1

In addition to the previous answers given, it seems this error is thrown as well when your injectable service is missing the actual @Injectable() decorator. So before you debug the cyclic dependency thing and the order of your imports/exports, do a simple check whether your service actually has @Injectable() defined.

This applies to the current Angular latest, Angular 2.1.0.

I opened an issue on this matter.