机器人程序对话框未启动

我想问你们,为什么我的机器人不会启动对话?

var restify = require('restify');
var builder = require('botbuilder');

// Setup Restify Server
var server = restify.createServer();
server.listen(process.env.port || process.env.PORT || 3978, function () {
   console.log('%s listening to %s', server.name, server.url);
});

// Create chat connector for communicating with the Bot Framework Service
var connector = new builder.ChatConnector({
    appId: process.env.MICROSOFT_APP_ID,
    appPassword: process.env.MICROSOFT_APP_PASSWORD
});


var luisAppUrl = process.env.LUIS_APP_URL || 'https://westus.api.cognitive.microsoft.com/luis/v2.0/apps/.......';
var bot = new builder.UniversalBot(connector);

var bot = new builder.UniversalBot(connector, function(session, args, next) {
  session.send('How can i help you ?')
  session.endDialog();
  next();
});

bot.recognizer(new builder.LuisRecognizer(luisAppUrl));


bot.dialog('Location', [
  function (session, args, next) {
  var intent = args.intent;
    var locations = builder.EntityRecognizer.findEntity(intent.entities, 'Location');
     var location = session.dialogData.location = {
       title: title
     };
    // session.send()
    if (!locations){
      builder.Prompts.text(session, 'From which settlement do you want to know the location? ')
    } else {
      next();
    }

  },
  function(session, results) {
    var location = session.dialogData.location;
    if(results.response){
      note.text = results.response;
      // session.send('Our company is located in Antwerp')
    }
  }
]).cancelAction({
  matches: /^(cancel|nevermind)/i,
  confirmPrompt: "Are you sure?"
});

所以我的机器人一直崩溃,无法启动。对话 你们知道怎么了吗?