When I was developing angular, I encountered the following errors:

core.js:6242 ERROR NullInjectorError: R3InjectorError(AppModule)[ChildrenOutletContexts -> ChildrenOutletContexts -> ChildrenOutletContexts]:
NullInjectorError: No provider for ChildrenOutletContexts!
at NullInjector.get (core.js:1086)
at R3Injector.get (core.js:16969)
at R3Injector.get (core.js:16969)
at R3Injector.get (core.js:16969)
at NgModuleRef$1.get (core.js:36344)
at Object.get (core.js:33987)
at getOrCreateInjectable (core.js:5849)
at Module. ɵɵ directiveInject (core.js:21118)
at NodeInjectorFactory.RouterOutlet_ Factory [as factory] (router.js:9156)
at getNodeInjectable (core.js:5994)

The reason is found in this stackoverflow discussion post:

This error is because the module generated by routermodule. Forchild() contains necessary instructions and routes, but does not contain routing service – routing provider. This is the purpose of routermodule.forroot: it generates a module containing necessary instructions, routes and routing services.

terms of settlement

Call routermodule.forroot ([]) in app.module.ts

Call routermodule.forchild in feature module to pass in the actual routing array:

More Jerry’s original articles can be found in: “Wang Zixi”: