Lazy Loading BrowserModule has already been loaded
Import BrowserModule, BrowserAnimationsModule, HttpModule or HttpClientModule only once, preferably in your root module.
angular2-modules
How to share service between two modules – @NgModule in angular not between to components?
As per the final version of Angular 2, services provided by a module are available to every other module that imports it. The Official Style Guide advice that application-wide services (singletons) that are to be reused anywhere in the application should be provided by some Core Module, that is to be imported in the main … Read more