Argument passed in must be a single String of 12 bytes or a string of 24 hex characters

ngOnInit():void{

            this.route.params.subscribe(params => console.log(params['id']));

         this.route.params.switchMap((params: Params) => this.noteService.getSingleNote(params['id']))
                                     .subscribe(note=> this.note = note);

    }

getSingleNote(id:string){
        return this.http.get('http://localhost:3000/api/note/:id')
                            .map(res=>res.json());
    }

router.get('/note/:id', function(req, res, next){

    db.stories.findOne({_id: mongojs.ObjectId(req.params.id)},function(err, story){
        if(err){
            res.send(err);
        }
        res.json(story);
    });

});