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我想在Ubuntu 10.04上運行Ruby的Watir。我在我的（無顯示器）服務器上安裝了Chrome和ChromeDriver，並安裝了selenium-webdriver Gem。但是，當我嘗試創建的Watir瀏覽器中，我得到：我的安裝Ruby Watir :: WebDriver有什麼問題？
$ irb
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'watir-webdriver'
=> true
irb(main):003:0> browser = Watir::Browser.new :chrome
NoMethodError: undefined method `closed?' for nil:NilClass
from /usr/lib/ruby/1.8/net/http.rb:1060:in `request'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/http/default.rb:83:in `response_for'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/http/default.rb:39:in `request'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/bridge.rb:598:in `raw_execute'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/bridge.rb:92:in `create_session'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/remote/bridge.rb:68:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/chrome/bridge.rb:29:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/common/driver.rb:37:in `new'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver/common/driver.rb:37:in `for'
from /usr/lib/ruby/gems/1.8/gems/selenium-webdriver-2.26.0/lib/selenium/webdriver.rb:65:in `for'
from /usr/lib/ruby/gems/1.8/gems/watir-webdriver-0.5.5/lib/watir-webdriver/browser.rb:35:in `initialize'
from (irb):3:in `new'
from (irb):3
from :0
irb(main):004:0>
了「的Watir :: Browser.new」通話後長時間的停頓，我假設某種超時？也許試圖與Chromedriver談談？我正在運行這些版本的相關寶石：
$ gem list
*** LOCAL GEMS ***
addressable (2.3.2)
childprocess (0.3.6)
fastercsv (1.5.5)
ffi (1.2.0, 1.0.11)
libwebsocket (0.1.3)
multi_json (1.3.7, 1.0.4)
rubygems-update (1.8.24)
rubyzip (0.9.9)
selenium-webdriver (2.26.0, 2.18.0)
watir-webdriver (0.5.5)
websocket (1.0.3)
yajl-ruby (1.1.0)