Problem with watir-classic

facebook.rb

# Ruby 1.9.3-p194 on Windows 7

require 'watir'

browser = Watir::Browser.new
browser.goto 'http://www.facebook.com'

# Result

c:/usr/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:548:in `
block in wait': undefined method `to_sym' for 4:Fixnum (NoMethodError)
        from c:/usr/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
        from c:/usr/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-clas
s.rb:526:in `wait'
        from c:/usr/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-clas
s.rb:375:in `goto'
        from facebook.rb:7:in `<main>'