Routing problem of a child module

I have a problem with routing that I can not fix.

I try to access the path / admin / login and it directs me to the root with a blank page and the following error in the console:

ZoneAwareError {__zone_symbol__error: Error: Uncaught (in promise): Error
Error
    at Error.ZoneAwareError (http://localhost:4200/polyfil……}

The other routes if they work

app.routing.module.ts

const appRoutes: Routes = [
    { path: 'admin', loadChildren: 'app/admin/admin.module#AdminModule'},
    { path: '', component: HomeComponent }
];

@NgModule({
    imports: [ RouterModule.forRoot(appRoutes) ],
    exports: [ RouterModule ]
})

admin.routing.module.ts

const AdminRoutes: Routes = [
    { path: 'login', component: AdminLoginComponent },
    { path: 'home', component: AdminHomeComponent },
    { path: '', component: AdminComponent },
];

@NgModule({
    imports: [ RouterModule.forChild(AdminRoutes) ],
    exports: [ RouterModule ]
})