问题
I'm using Selenium 2.7.0 and Python 2.6, my OS is Mac OS X 10.7. When I'm trying to instantiate webdriver object I'm getting the following message:
selenium.common.exception.WebDriverException: Message: ''
Previously I was using Selenium 2.13.0, but I've installed older version because I have working installation on another machine. The first attempt (after reinstallation) to launch webdriver was successful, but all subsequent are not. Then I tried to use Chrome driver instead Firefox, and got the same situation: successful first attempt and unsuccessful subsequent ones. It's quite hard to google because error message is empty.
来源：https://stackoverflow.com/questions/8470193/selenium-fails-with-empty-exception-message