Unexpected value 'undefined' declared by the module 'AppModule'

Question

What is wrong here? I\'m trying to make it work but I get that error in the header. I have included the in the app

Answer 1

In my case it was due to build issue. may be you have added some components or other things in your App module and forgot to rebuild it. So in the browser Angular is not able to recognize your fresh entries in app module because build is required to register them properly. So for development mode kill the current server and use ng serve.