执行示例脚本报错，求教

[java-Learner-lx]

create_new_tab error: HTTPConnectionPool(host='127.0.0.1', port=9222): Max retries exceeded with url: /json/new?https://www.zhihu.com/ (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x10b42ee50>: Failed to establish a new connection: [Errno 61] Connection refused',))
start_tab error: 'NoneType' object has no attribute 'start'
exec_js_cmd error: 'NoneType' object has no attribute 'Runtime'
get_page_status error: 'NoneType' object has no attribute 'getitem'
exec_js_cmd error: 'NoneType' object has no attribute 'Runtime'
Traceback (most recent call last):
File "run_zhihu.py", line 36, in
run(zhihu_url)
File "run_zhihu.py", line 32, in run
tab.wait(1)
AttributeError: 'NoneType' object has no attribute 'wait'