ruby - Cannot create firefox browser with watir-webdriver -

ruby - Cannot create firefox browser with watir-webdriver -

i have firefox 20 works version of watir-webdriver. utilize next code can open browser or headless phantomjs browser. chrome , phantom work, firefox throws exception.

why? how prepare ?

require 'rubygems' require 'watir-webdriver' require 'phantomjs' def get_browser(browser_name) browser = nil if browser_name != nil puts "\n#{browser_name} created\n" browser = watir::browser.new browser_name.to_sym else puts "creating phantom browser !" browser = watir::browser.new :phantomjs puts "\nphantom created\n" end homecoming browser end browser_name = argv[0] browser = get_browser(browser_name) puts "\n\n" browser.close

exception-

c:/code/ruby/lib/ruby/gems/1.8/gems/json_pure-1.4.3/lib/json/pure/generator.rb:393:in `to_json': undefined method `ascii_only?' {}:hash (nomethoderror) c:/code/ruby/lib/ruby/gems/1.8/gems/multi_json-1.3.7/lib/multi_json/adapters/json_common.rb:11:in `dump' c:/code/ruby/lib/ruby/gems/1.8/gems/multi_json-1.3.7/lib/multi_json.rb:115:in `dump' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/common/json_helper.rb:23:in `json_dump' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:254:in `write_prefs' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:253:in `each' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:253:in `write_prefs' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:252:in `open' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:252:in `write_prefs' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:232:in `update_user_prefs_in' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/profile.rb:79:in `layout_on_disk' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/launcher.rb:58:in `create_profile' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/launcher.rb:34:in `launch' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/socket_lock.rb:20:in `locked' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/launcher.rb:32:in `launch' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/firefox/bridge.rb:24:in `initialize' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/common/driver.rb:31:in `new' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver/common/driver.rb:31:in `for' c:/code/ruby/lib/ruby/gems/1.8/gems/selenium-webdriver-2.33.0/lib/selenium/webdriver.rb:67:in `for' c:/code/ruby/lib/ruby/gems/1.8/gems/watir-webdriver-0.6.2/lib/watir-webdriver/browser.rb:46:in `initialize' watir-browser.rb:9:in `new' watir-browser.rb:9:in `get_browser' watir-browser.rb:19

you code working me without issue.

$ ruby test.rb creating phantom browser ! phantom created $ ruby test.rb firefox firefox created $ ruby test.rb chrome chrome created $ gem list | grep webdriver selenium-webdriver (2.45.0, 2.44.0) watir-webdriver (0.7.0, 0.6.11)

firefox comes selenium-webdriver, need update gem(s)

ruby watir watir-webdriver