Protractor-cucumberjs：browser.get（）不起作用

当我用量角器运行cucumberjs时，我收到错误消息，任何人都可以帮助我提出理由：

c：\ Users \ Dave.Le \ AppData \ Roaming \ npm \ node_modules \ protractor \ node_modules \ selenium-webdriver \ lib \ atoms \ error.js：108 var template = new Error（this.message）; ^ NoSuchElementError：无法找到元素：{“method”：“id”，“selector”：“log”}有关此错误的文档，请访问：http：//seleniumhq.org/exceptions/no_such_element.html构建信息：版本：'2.47.1'，修订版：'411b314'，时间：'2015-07-30 03:03:16'系统信息：主机：'DaveLe-PC'，ip：'192.168.1.16'，os.name ：'Windows 7'，os.arch：'x86'，os.version：'6.1'，java.version：'1.7.0_75'驱动程序信息：driver.version：未知新bot.Error（c：\ Users \在Object.bot.response.checkResponse（c：\ Users \ Dave.Le \）的Dave.Le \ AppData \ Roaming \ npm \ node_modules \ protractor \ node_modules \ selenium-webdriver \ lib \ atoms \ error.js：108：18）应用程序数据\漫游\ NPM \ node_modules \量角器\ node_modules \硒的webdriver \ lib中\原子\ response.js：109：9），在C：\用户\ Dave.Le \应用程序数据\漫游\ NPM \ node_modules \量角器\ node_modules \硒的webdriver \ lib中\的webdriver \ webdriver.js：379：20在[对象的对象] .promise.ControlFlow.runInFrame_（C：/Users/Dave.Le/AppData/Roaming/npm/node_modules/protractor/node_modules/selenium- webd river / lib / goog /../ webdriver / promise.js：1857：20）at [object Object] .goog.defineClass.notify（c：/Users/Dave.Le/AppData/Roaming/npm/node_modules/protractor/ node_modules / selenium-webdriver / lib / goog /../ webdriver / promise.js：2448：25）at [object Object] .promise.Promise.notify_（c：/Users/Dave.Le/AppData/Roaming/npm/ node_modules /量角器/ node_modules /硒的webdriver / LIB / goog /../的webdriver / promise.js：564：12）在Array.forEach（天然）在[对象的对象] .promise.Promise.notifyAll_（C：/用户/Dave.Le/AppData/Roaming/npm/node_modules/protractor/node_modules/selenium-webdriver/lib/goog/../webdriver/promise.js:553:15）在goog.async.run.processWorkQueue（C：\用户\ Dave.Le \应用程序数据\漫游\ NPM \ node_modules \量角器\ node_modules \硒的webdriver \ lib中\ goog \异步\ run.js：130：15）在process._tickDomainCallback（node.js中：409：9）[ launcher]进程已退出，错误代码为1

---------------------- loginpage.js -------------------

'use strict';

( function () {

var navigate = function () {
    browser.get( 'http://store.demoqa.com/products-page/your-account/' );
};

var login = function ( username, password ) {
    this.username.sendKeys( username );
    this.password.sendKeys( password );
    this.loginButton.click();
};

var LoginPage = function () {
    this.username     = dv.findElement( by.id( 'log' ) );
    this.password     = dv.findElement( by.id( 'pwd' ) );
    this.loginButton  = dv.findElement( by.id( 'login' ) );
};

LoginPage.prototype.navigate = navigate;
LoginPage.prototype.login    = login;

module.exports = LoginPage;

} )();

------------------------ spec.js ---------------------

'use strict';

var LoginPage      = require( '../login/loginpage.js' );

var HomePage       = require( '../../features/homepage/homepage.js' );

var chai           = require( '../../chai' );

var chaiAsPromised = require( '../../chai-as-promised' );

chai.use( chaiAsPromised );

var expect = chai.expect;

module.exports = function () {

var loginPage;
var homePage;

this.Before( function ( callback ) {
    loginPage = new LoginPage();
    homePage  = new HomePage();
    isAngularSite(false);
    loginPage.navigate();
    callback();

} );

this.After( function ( callback ) {
    //logout
    callback();
} );

// First Scenario
//this.When('I am in login page')

this.Given(/^I login using valid creadentials$/, function ( callback ) {

    loginPage.login( 'username', 'password' ); //valid creadential
    callback();
} );

this.Then(/^I should be logged in$/, function ( callback ) {
    expect(homePage.homeIndicator).toEqual('http://someUrl.com/#home');
    callback();
} );

};

---------------------- config.js ------------------

'use strict';

var config = {

seleniumAddress : 'http://localhost:4444/wd/hub',
specs           : [ 'features/login/login.feature' ],
baseUrl         : 'http://store.demoqa.com/',
capabilities    : {
browserName : 'firefox'
},

onPrepare   : function () {
var width  = 1024;
var height = 600;

global.dv = browser.driver;

dv.manage().window().setSize( width, height );

// This will tell the Protractor not to wait for angular
global.isAngularSite = function(flag) {
    browser.ignoreSynchronization = !flag;
};
},

framework : 'cucumber',

cucumberOpts : {
// define your step definitions in this file
require : 'features/login/spec.js',
//format  : 'pretty'
}

};

exports.config = config;

--------------- login.feature -----------------

Feature: Login

As a user, I should be able to have login creadentials so that I can login to    the system

Scenario: Valid login creadentials

Given I login using valid creadentials

Then I should be logged in