title: Angular 2 - Can't resolve all parameters for component: (?)
body: <p>I started an Angular2 app and I have an issue since days ! </p>
  
  <pre><code>Can't resolve all parameters for HomeComponent: (?).(…) 
  </code></pre>
  
  <p>But my issue is not about a particular provider : Everyting that I try to inject in my HomeComponent constructor return that error. No similars questions on that errors resolved my situation, and now I spent so much time looking for this that I can't find it.</p>
  
  <p>App.moodule.ts : </p>
  
  <pre class="lang-js prettyprint-override"><code>  import { NgModule }      from '@angular/core';
    import { BrowserModule } from '@angular/platform-browser';
    import { RouterModule }   from '@angular/router';
    import { SimpleNotificationsModule } from 'angular2-notifications';
  
    // Controllers
    import { AppComponent }  from './app.component';
    import { HomeComponent }  from './components/home.component';
  
    // Service
    import { AuthService } from './services/auth.service';
  
    // Guards
    import { AuthGuard } from './guards/auth.guard';
  
    @NgModule({
      imports: [ 
          BrowserModule,
          RouterModule.forRoot([
          {
            path: '',
            component: HomeComponent,
            canActivate: [AuthGuard]
          }
        ]),
        SimpleNotificationsModule
      ],
      declarations: [ 
          AppComponent,
          HomeComponent
      ],
      providers: [
          AuthGuard,
        AuthService,
      ],
      bootstrap: [ AppComponent ]
    })
  
    export class AppModule { }
  </code></pre>
  
  <p>My HomeComponent :</p>
  
  <pre class="lang-js prettyprint-override"><code>import { Component, OnInit } from '@angular/core';
  import { Router } from '@angular/router';
  
  import { NotificationsService } from 'angular2-notifications';
  
  import { AuthService } from '../services/auth.service';
  
  @Component({
      selector: 'home',
      templateUrl: '/templates/home.html'
  })
  
  export class HomeComponent implements OnInit 
  {
      public test: boolean = false;
  
      constructor( 
          private _authService: AuthService
      ) {}
  
      ngOnInit()
      {
          this.test = true;
      }
  }
  </code></pre>
  
  <p>The AuthService that I try to import is empty, and as I said every providers that I inject in HomeComponent return that error. Each constructor argument create a new question mark in the error. Let me know if you need more code, but I don't think the rest (templates, systemjs.config.js...) is the problem </p>