LoadError: cannot load such file -- selenium/webdriver/phantomjs

[江南]

Hi,

I have been using the code below until yesterday it was working all fine but today I am seeing this message:

In my Cucumber Hooks file I have:

Before do
  Selenium::WebDriver::PhantomJS.path = 'C:\phantomjs-2.1.1-windows\bin\phantomjs.exe'
  @browser = Watir::Browser.start "https://www.google.com" ,:phantomjs
  @browser.window.maximize
  @browser.wait
end

LoadError: cannot load such file -- selenium/webdriver/phantomjs

Can someone please tell me what is the problem? 

Thanks