Building a Bot for Facebook Messenger using IBM Bluemix: Weather JS code

gistfile1.txt

var express = require('express');
var request = require('request');
var bodyParser = require('body-parser');
var geocoderProvider = 'google';
var httpAdapter = 'http';
var geocoder = require('node-geocoder')(geocoderProvider, httpAdapter);
var watson = require('watson-developer-cloud');
var cfenv = require('cfenv');

var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

// var appEnv = cfenv.getAppEnv();
// var envVars = process.env;
var classifier = <CLASSIFIER_ID> //pre-trained classifier that distinguishes between a weather conditions question and temperature question
var vcap = JSON.parse(process.env.VCAP_SERVICES);

var nlClassifier = watson.natural_language_classifier({
    url : vcap.natural_language_classifier[0].credentials.url,
    username : vcap.natural_language_classifier[0].credentials.username,
    password : vcap.natural_language_classifier[0].credentials.password,
    version  : 'v1'
});
var weatherUserName = vcap.weatherinsights[0].credentials.username;
var weatherPassword = vcap.weatherinsights[0].credentials.password;
var alchemyApiKey = vcap.alchemy_api[0].credentials.apikey;

app.get('/getWeather', function (req,responseToRequest) {
    var extractedLocation;
    text = req.query.text;
    extractedLocation = text;
// Extracting the location from the input text using Watson AlChemyAPI service //
    request("https://gateway-a.watsonplatform.net/calls/text/TextGetRankedNamedEntities?apikey=" + alchemyApiKey + "&text=" + text + "&outputMode=json", function(error, response, body) {
        var entities = JSON.parse(body).entities;
        for (i = 0; i < entities.length; i++) {
            if(entities[i].type === "Country" || entities[i].type === "City" || entities[i].type === "County" || entities[i].type === "State" || entities[i].type === "StateOrCounty"){
                extractedLocation = entities[i].text;
            }
        }
// As a backup, you can also extract the location using a specialized engine such as node-geocoder //
        geocoder.geocode(extractedLocation).then(function(res) {
            if(res[0]){
// Requesting weather data from Bluemix Insights for Weather Service //
                request("https://" + weatherUserName + ":" + weatherPassword + "@twcservice.mybluemix.net/api/weather/v2/observations/current?units=m&geocode=" + res[0].latitude + "%2C" + res[0].longitude + "&language=en-US", function(error, response, body) {
                    var json = JSON.parse(response.body);
                    var params = {
                        classifier: classifier, // identifying type of question using the pre-trained classifier
                        text: text
                    };
                    nlClassifier.classify(params, function(error,results){
                        var message = "Could not identify if question is about weather conditions or temperature";
                            var location = "";
                            if (res[0].city) {
                                location += res[0].city + ", ";
                            }
                            if (res[0].country) {
                                location += res[0].country;
                            }

                            for (i = 0; i < results.classes.length; i++) {
                                if (results.classes[i].confidence > 0.8) {
                                    if (results.classes[i].class_name === "temperature") {
                                        message = "Temperature in " + location + " is " + json.observation.metric.temp_min_24hour + "--" + json.observation.metric.temp_max_24hour;
                                    } else if (results.classes[i].class_name === "conditions") {
                                        message = "Weather in " + location + " is " + json.observation.sky_cover; // Returned message determined according to the classifier's result
                                    }
                                }
                            }
                        responseToRequest.send(message);
                    });
                });
            } else {
                responseToRequest.send("Location not identified");
            }
        }).catch(function(err){responseToRequest.send("Location not identified");});
    });
});

var host = (process.env.VCAP_APP_HOST || 'localhost');
var port = (process.env.VCAP_APP_PORT || 3000);
app.listen(port,host);

When I push the weather app to bluemix, it said don't know 0 of " vcap.natural_language_classifier[0].credentials.url".so I hard code it.
The value of entities get from JSON.parse(body).entities is zero.I don't know why??