Unhandled rejection (<{"state":"failed","reason":{"code":13,...>, no stack trace)

[raluiz]

Quando tento rodar o código do index.js, recebo o seguinte erro Unhandled rejection (<{"state":"failed","reason":{"code":13,...>, no stack trace).
Utilizei o comando node index.js para executar o arquivo pelo terminal.

index.js

let BlipSdk = require('blip-sdk');
let WebSocketTransport = require('lime-transport-websocket');

// Put your identifier and access key here
let IDENTIFIER = 'example';
let ACCESS_KEY = 'example';

// Create a client instance passing the identifier and accessKey of your chatbot
let client = new BlipSdk.ClientBuilder()
    .withIdentifier(IDENTIFIER)
    .withAccessKey(ACCESS_KEY)
    //Erro no arrow function
    .withTransportFactory(() => new WebSocketTransport())
    .withTransportFactory(function() { return (new WebSocketTransport())})
    .build();

// Connect with server asynchronously
// Connection will occurr via websocket on 8081 port.
client.connect() // This method return a 'promise'.
    .then(function(session) {
        // Connection success. Now is possible send and receive envelopes from server. */
        console.log('Application started. Press Ctrl + c to stop.')
    })
    .catch(function(err) { /* Connection failed. */ });

[ceifa]

Can you post the entire error object? It contains the error reason and stacktrace, which help us to identify the problem.