I'm implementing `resolve` method:

```
resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Obj> | Obj {
        return this.service.get(route.params['guid'])
            .map((response: Json) => {
                return this.service.list(response.data.id).map((response: Json) => {
                    return <Obj>response.data;
                });
        });

```

But I have error `Can't convert to Observable<Observable<Obj>>`.

How can I resolve that issue?