how to open tor browser using watir?

how to open tor browser using watir?

With my ruby code I want to open Tor Browser instead of Firefox,for this I
tried this code
path='C:\Tor Browser\App\tor.exe'
Selenium::WebDriver::Firefox.path = path
driver = Selenium::WebDriver.for :firefox
ie = Watir::Browser.new :firefox, :driver => driver
I got this error
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:79:in
`connect_until_stable': unable to obtain stable firefox connection in 60
seconds (127.0.0.1:7055) (Selenium::WebDriver::Error::WebDriverError)
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:37:in
`block in launch'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/socket_lock.rb:20:in
`locked'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/launcher.rb:32:in
`launch'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/firefox/bridge.rb:24:in
`initialize'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/common/driver.rb:31:in
`new'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver/common/driver.rb:31:in
`for'
from
c:/Ruby193/lib/ruby/gems/1.9.1/gems/selenium-webdriver-2.35.1/lib/selenium/webdriver.rb:67:in
`for'
from C:/new_trademap/newTrademapTest.rb:28:in `<main>'
What should I have to do ? or there is any other way to do so?