The error message "A router outlet has not been instantiated during routes activation" in Angular typically occurs when you haven't defined a <router-outlet></router-outlet> element in your template or when you have placed the <router-outlet></router-outlet> in the wrong location.

To resolve this error, follow these steps:

  1. Verify that you have placed the <router-outlet></router-outlet> element in the correct template file. The <router-outlet> tag is responsible for rendering the component associated with the current route. Make sure you have included it in the parent component's template where the child components should be displayed.

  2. Ensure that the <router-outlet> element is not nested inside another HTML element. It should be placed directly in the parent component's template without any nesting. For example:

    html
    <!-- Correct placement of router-outlet --> <div> <router-outlet></router-outlet> </div>
    html
    <!-- Incorrect placement of router-outlet --> <div> <div> <router-outlet></router-outlet> </div> </div>

    The <router-outlet> element should be a direct child of the parent component.

  3. If you have multiple router outlets in your application, ensure that you are targeting the correct outlet in your routing configuration. In the router configuration (usually in app-routing.module.ts), make sure that the outlet property of each route matches the name of the <router-outlet> element where you want the component to be rendered.

    For example:

    typescript
    const routes: Routes = [ { path: 'home', component: HomeComponent, outlet: 'mainOutlet' }, { path: 'about', component: AboutComponent, outlet: 'sidebarOutlet' }, ];

    In this example, you would need <router-outlet name="mainOutlet"></router-outlet> and <router-outlet name="sidebarOutlet"></router-outlet> in your template to match the named outlets.

By ensuring that you have placed the <router-outlet> element in the correct location and that it is not nested inside another element, you should be able to resolve the "A router outlet has not been instantiated during routes activation" error in your Angular application.

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