爬虫抓取网站上的商品出现的错误

File "C:\Python27\Lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 192, in check_response
raise exception_class(message, screen, stacktrace)

    这是什么错误

http://zhidao.baidu.com/link?url=hO7fgjGiibl6CK3AnhcDx7W-kw2YM1j8jTB7KJMdszBkU5RrgeNNvGqCLxOXJKs44_nQrnQ6JNHErM1BBWNSD4HbwIFZBV9-fG-pYdpLILS

错误提示来看应该是该html的element不可见导致

http://stackoverflow.com/questions/31643418/raise-timeoutexceptionmessage-screen-stacktrace-timeoutexception-message
http://stackoverflow.com/questions/24715505/selenium-select-an-element-with-xpath-in-python