Uncaught (in promise): TypeError: Cannot read property 'component' of null : <p>Getting this error when trying to use nestet route in Angular 4:</p>

<pre><code>ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'component' of null
TypeError: Cannot read property 'component' of null
    at PreActivation.webpackJsonp.../../../router/@angular/router.es5.js.PreActivation.traverseRoutes (http://localhost:4200/vendor.bundle.js:77976:71)
    at http://localhost:4200/vendor.bundle.js:77954:19
    at Array.forEach (native)
    at PreActivation.webpackJsonp.../../../router/@angular/router.es5.js.PreActivation.traverseChildRoutes (http://localhost:4200/vendor.bundle.js:77953:29)
    at PreActivation.webpackJsonp.../../../router/@angular/router.es5.js.PreActivation.traverseRoutes (http://localhost:4200/vendor.bundle.js:77985:22)
</code></pre>

<p>This is my routing code:</p>

<pre><code>const appRoutes: Routes = [
    {
        path: '',
        component: HomeComponent
    },

    {
        path: 'sobre',
        component: SobreComponent
    },
    {
        path: 'c/:concurso', component: ConcursoItemComponent

        , children: [         
            {

                path: ':cargo',
                component: CargoItemComponent,


                children: [
                    {
                        path: ':disc',
                        component: DisciplinaItemComponent,
                        children: [{
                            path: ':assunto',
                            component: AssuntoItemComponent
                        }]
                    }
                ]

            }
        ]
    },

];
</code></pre>

<p>I want to make the following nested rules, each one using the variables to inform the nested components of each route:</p>

<p>/</p>

<p>/c/:concurso/</p>

<p>/c/:concurso/:cargo/</p>

<p>/c/:concurso/:cargo/:disc/</p>

<p>/c/:concurso/:cargo/:disc/:assunto</p>

<p>On each level, I will need all the upper variables to make the correct querying of the related objects of the API.</p>

<p>Thanks for any help!</p>
