angular - No provider for ChildrenOutletContexts (injectionError)

Question

I am getting the following error when using Angular CLI to generate a routing module for my application:

ERROR Error: No provider for ChildrenOutletContexts!
    at injectionError (core.es5.js:1169)
    at noProviderError (core.es5.js:1207)
    at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._throwOrNull (core.es5.js:2649)
    at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._getByKeyDefault (core.es5.js:2688)
    at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._getByKey (core.es5.js:2620)
    at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_.get (core.es5.js:2489)
    at resolveNgModuleDep (core.es5.js:9481)
    at NgModuleRef_.webpackJsonp.../../../core/@angular/core.es5.js.NgModuleRef_.get (core.es5.js:10569)
    at resolveDep (core.es5.js:11072)
    at createClass (core.es5.js:10936)

I generated the routing module with Angular CLI like this:

ng generate module --routing App

This is the contents of the routing module:

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { MyComponent } from './my/my.component';

const routes: Routes = [
  {
    path: '',
    component: MyComponent,
  },
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule],
  declarations: []
})
export class AppRoutingModule { }

And this is what I have in my app.component.html:

<div class="container" role="main">
    <router-outlet></router-outlet>
</div>

What can be the reason of this error?

Answer 1

To solve this problem change this line:

imports: [RouterModule.forChild(routes)],

to:

imports: [RouterModule.forRoot(routes)],

The error is caused because RouterModule.forChild() generates a module that contains the necessary directives and routes but doesn't include the routing service. That is what RouterModule.forRoot is for: it generates a module that contains the necessary directives, routes, and the routing service.

More information in Angular docs: Angular - Router Module.