selenium remote出错

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今天试了下selenium server,按照书上的教程走，怎么弄都是抛出错误

selenium.common.exceptions.WebDriverException: Message: Error forwarding the new session Empty pool of VM for setup Capabilities [{browserName=chrome, version=, platform=ANY}]

代码是

# -*- coding: utf-8 -*-from selenium.webdriver import Remoteimport time#定义主机list={'http://127.0.0.1:4444/wd/hub':'chrome'}for host,browser in list.items():    print(host,browser)    driver=Remote(command_executor=host,                  desired_capabilities={                                        "browserName": "chrome",                                        "version": "",                                        "platform": "ANY"}                  )    driver.get("http://www.baidu.com")    driver.find_element_by_id('kw').send_keys(browser)    driver.find_element_by_id('su').click()    time.sleep(2)    driver.close()

找了一圈发现只有Stack overflow上有答案
我就在一个终端上开启hub:

java -jar selenium-server-standalone-2.40.0.jar -role hub

一个开启node,指定下chromedriver的地址：

java -jar selenium-server-standalone-2.40.0.jar -role node -hub http://localhost:4444/wd/hub -browser “browserName=chrome,maxinstance=1,platform=WINDOWS” -Dwebdriver.chrome.driver=F://Anaconda3//envs//tensorflow//chromedriver.exe

然后再运行代码就行了。。。这是怎么搞的？

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