it doesn't work for me

[crixthegreat]

I've checked the cookie file,
D:\study_score-master\cookie\cookie.json
It's like this:

[{'domain':` 'xuexi.cn', 'expiry': 1560931759.294422, 'httpOnly': False, 'name': 'token', 'path': '/', 'secure': False, 'value': '818e735c2e4c4c52acdc9049457382d2'}, {'domain': 'xuexi.cn', 'expiry': 1592446112.386617, 'httpOnly': False, 'name': '__UID__', 'path': '/', 'secure': False, 'value': '2342fcc0-9237-11e9-8327-c1dd3b179f3c'}]

then I got this error

Traceback (most recent call last):
  File "D:\study_score-master\spider\step_content.py", line 34, in <module>
    driver.add_cookie(i)
  File "D:\python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 894, in add_cookie
    self.execute(Command.ADD_COOKIE, {'cookie': cookie_dict})
  File "D:\python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "D:\python\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidArgumentException: Message: invalid argument: invalid 'expiry'
  (Session info: headless chrome=75.0.3770.100)

why is the argument 'expiry' invalid?