[ERROR] NG8001: 'router-outlet' is not a known element:

Hi

   I am getting below error - 

[ERROR] NG8001: 'router-outlet' is not a known element:
1. If 'router-outlet' is an Angular component, then verify that it is included in the '@Component.imports' of this component.
2. If 'router-outlet' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@Component.schemas' of this component to suppress this message. [plugin angular-compiler]

    src/app/Pages/layout/layout.component.html:16:4:
      16 ¦    

Thanks