selenium server无法启动浏览器

from selenium.webdriver import Remote
import time

driver = Remote(command_executor = 'http://127.0.0.1:4444/wd/hub',
                    desired_capabilities = {"browserName": "chrome",
                                            "version": "",
                                            "platform": "ANY",
                                            "javascriptEnabled": True,
                                            }
                )

driver.get('http://www.baidu.com')
driver.find_element_by_id('kw').send_keys('Remote')
driver.find_element_by_id('su').click()
time.sleep(2)

driver.quit()

报错信息如下：
Traceback (most recent call last):
  File "C:\Users\Administrator\Desktop\Python\rrts.py", line 9, in <module>
    "javascriptEnabled": True,
  File "D:\Program Files (x86)\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 90, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "D:\Program Files (x86)\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 177, in start_session
    response = self.execute(Command.NEW_SESSION, capabilities)
  File "D:\Program Files (x86)\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 236, in execute
    self.error_handler.check_response(response)
  File "D:\Program Files (x86)\Python\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 192, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Error forwarding the new session Empty pool of VM for setup Capabilities [{browserName=chrome, javascriptEnabled=true, version=, platform=ANY}]
Stacktrace:
    at org.openqa.grid.web.servlet.handler.RequestHandler.process (RequestHandler.java:115)
    at org.openqa.grid.web.servlet.DriverServlet.process (DriverServlet.java:83)
    at org.openqa.grid.web.servlet.DriverServlet.doPost (DriverServlet.java:67)
    at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)
    at org.seleniumhq.jetty9.servlet.ServletHolder.handle (ServletHolder.java:808)