Angular 6 - can't resolve all parameters for AppComponent

Question

I am trying to build an application with Angular 6 and I am still setting everything up. But it seems there is something wrong with the dependency injection in my app.

Answer 1

GET / or compiler error can't resolve all parameters for ApplicationModule: (?).

Just follow these simple steps :

1. Install core-js modeule.

npm i core-js

2. In the polyfills.ts file add the import statement

import 'core-js/es7/reflect';

3. In main.ts file add the import statements

import 'core-js/es6/reflect';

import 'core-js/es7/reflect';