Error: src/app/app.component.html:501:1 – error NG8001: ‘router-outlet’ is not a known element:

1. If ‘router-outlet’ is an Angular component, then verify that it is part of this module.
2. If ‘router-outlet’ is a Web Component then add ‘CUSTOM_ELEMENTS_SCHEMA’ to the ‘@NgModule.schemas’ of this component to suppress this message.

501
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src/app/app.component.ts:5:16
5 templateUrl: ‘./app.component.html’,
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Error occurs in the template of component AppComponent.