当使用弹出窗口时，显示“已调用的对象与客户端断开连接”错误消息

require \'watir/ie\'
require \'win32ole\'


iewin = Watir::IE.new
iewin.goto(\"http://www.w3schools.com/js/tryit_view.asp?filename=tryjs_confirm\")
iewin=Watir::IE.attach(:url, /w3schools/)
iewin.bring_to_front
iewin.maximize
iewin.button(:value, \"Show a confirm box\").click_no_wait
txt = iewin.clickprompt(\"OK\") # waits for popup and click ok
puts txt #prints the popup text
txt1=iewin.clickprompt(\"OK\")
puts txt1

iewin.close

C:/Ruby192/lib/ruby/gems/1.9.1/gems/watir-1.7.1/lib/watir/ie-class.rb:319:in `method_missing\': unknown property or method: `name\' (NoMethodError)
    HRESULT error code:0x80010108
      The object invoked has disconnected from its clients.
    from C:/Ruby192/lib/ruby/gems/1.9.1/gems/watir-1.7.1/lib/watir/ie-class.rb:319:in `exists?\'
    from C:/Ruby192/lib/ruby/gems/1.9.1/gems/watir-1.7.1/lib/watir/ie-class.rb:406:in `close\'
    from popup.rb:50:in `<main>\'
Press a button!
You pressed OK!