app/app.module.ts | Defines the root module, named AppModule, that tells Angular how to assemble the application. Initially declares only the AppComponent. As you add more components to the app, they ...

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?) Was this an app that wasn't created using the CLI? What change did you do on your code? etc. installing module create ...