Getting undefined when to add a data node in replica set in mongodb from Node.js

I am trying to add a data node in replica set in MongoDB from Node.js but it is not adding the data node into the replica set

     //This is my code
    var Db = require('mongodb').Db,//The modules importing
        MongoClient = require('mongodb').MongoClient,
        Server = require('mongodb').Server,
        ReplSet = require('mongodb').ReplSet,
        ObjectID = require('mongodb').ObjectID,
        Binary = require('mongodb').Binary,
        GridStore = require('mongodb').GridStore,
        Grid = require('mongodb').Grid,
        Code = require('mongodb').Code,
        assert = require('assert');

   //The ip address of my machine and port number 
    MongoClient.connect('mongodb://192.168.0.10:27217/test', function(err, db) {
        console.log(".....");
    // Use the admin database for commands
        var adminDb = db.admin();
        console.log(".....Going");
    // Default replica set conf
        var conf = {
            _id: "rpl0",
            members: [
                {
                    _id: 2,
                    host: "192.168.0.10:27217"
                },
                {
                    _id: 2,
                    host: "192.168.0.10:27317"
                },
                {
                    _id: 3,
                    host: "192.168.0.10:27417"
                },
                {
                    _id: 4,
                    host: "192.168.0.7:27017"
                }
            ]
        };
    //The command for adding the member
       adminDb.command({replSetConfig: conf}, function(err, info) {
            console.log(info);
        });
    })

//This is what I am getting the output: .... .....Going undefined //I don't understand what wrong I am doing.

via kiranshahdadpuri