Cannot match any routes. URL Segment: '': When trying to use child routes and Ng2
<p>I have <a href="https://plnkr.co/edit/PHaGNtfa0fPBgET4NEpZ?p=preview" rel="nofollow noreferrer">the following plunker</a>, which does not work. In order to get it to work I can comment out...</p>

<pre><code>RouterModule.forRoot([
      {
          path: "",
          component: TestComponent,
          children: [
              // {
              //    path:"",
              //    outlet: "other",
              //    component: TestComponent
              // }
          ]
      }
])
</code></pre>

<p>If I don't do that I get...</p>

<pre><code>EXCEPTION: Uncaught (in promise): Error: Cannot match any routes. URL Segment: ''
Error: Cannot match any routes. URL Segment: ''
</code></pre>

<p>How do I add a child route?</p>