irb(main):026:0s text_field :(:id => 'b').value
Watir::Exception::UnknownObjectException: unable to locate element, using {:type=>"(any text type)", :tag_name=>"input or textarea", :id=>"b"}
        from /usr/local/lib64/ruby/gems/1.8/gems/watir-webdriver-0.6.1/lib/watir-webdriver/elements/element.rb:365:in `assert_exists'
        from /usr/local/lib64/ruby/gems/1.8/gems/watir-webdriver-0.6.1/lib/watir-webdriver/attribute_helper.rb:71:in `value'
        from (irb):26
irb(main):027:0>