self._get_services_status()))RuntimeError: The services status exception:

import json
from nebula2.gclient.net import ConnectionPool
from nebula2.Config import Config
from nebula2.common import *


if __name__=='__main__':
    client =None
    try:
        config = Config()
        config.max_connection_pool_size=2
        connection_pool = ConnectionPool()
        connection_pool.init([('192.168.52.91',9669)],config)
        client = connection_pool.get_session('root','123')
        assert client is not None
        resp_json = client.execute_json("yield 1")
        json_obj = json.loads(resp_json)
        print(json.dumps(json_obj,indent=2,sort_keys=True))
    except Exception as x:
        import traceback
        print(traceback.format_exc())
        if client is not None:
            client.release()
        exit(1)
[2021-10-28 12:24:12,222] WARNING  [ConnectionPool.py:203]:Connect 192.168.52.91:9669 failed: Method name verifyClientVersion not found
Traceback (most recent call last):
  File "F:/知识图谱/nebula_conn/nebula_conn.py", line 15, in <module>
    connection_pool.init([('192.168.52.91',9669)],config)
  File "E:\Anaconda3\lib\site-packages\nebula2_python-2.5.0-py3.6.egg\nebula2\gclient\net\ConnectionPool.py", line 78, in init
    self._get_services_status()))
RuntimeError: The services status exception: [services: ('192.168.52.91', 9669), status: BAD]