Selenium 2.5 无法在 Android 上使用 driver.get

Question

我在 iOS 上一切运行良好，并且正在尝试启动并运行 Android Web 测试。我正在用 Python 2.7.2 编写测试。
当我尝试以下代码时出现异常：

from selenium import webdriver
driver = webdriver.Remote(desired_capabilities="ANDROID", command_executor='http://localhost:8080/wd/hub')
driver.get('http://www.google.com')

我在 driver.get 命令中遇到异常。但同样的命令也适用于 iOS。 Android 有不同的实现吗？

例外：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium-2.5.0-py2.7.egg/selenium/webdriver/remote/webdriver.py", line 154, in get
    self.execute(Command.GET, {'url': url})
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium-2.5.0-py2.7.egg/selenium/webdriver/remote/webdriver.py", line 144, in execute
    self.error_handler.check_response(response)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium-2.5.0-py2.7.egg/selenium/webdriver/remote/errorhandler.py", line 118, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: None ; Stacktrace: Method handle threw an error in WebDriverHandler.java