mongoDB 연결 에러 떠요

Traceback (most recent call last):

 File "/Users/pisi/Desktop/sparta/pythonprac/dbprac.py", line 9, in <module>

  db.users.insert_one(doc)

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/collection.py", line 621, in insert_one

  self._insert_one(

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/collection.py", line 562, in _insert_one

  self.__database.client._retryable_write(acknowledged, _insert_command, session)

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1447, in _retryable_write

  with self._tmp_session(session) as s:

 File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 113, in __enter__

  return next(self.gen)

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1729, in _tmp_session

  s = self._ensure_session(session)

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1712, in _ensure_session

  return self.__start_session(True, causal_consistency=False)

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1657, in __start_session

  self._topology._check_implicit_session_support()

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/topology.py", line 538, in _check_implicit_session_support

  self._check_session_support()

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/topology.py", line 554, in _check_session_support

  self._select_servers_loop(

 File "/Users/pisi/Desktop/sparta/pythonprac/venv/lib/python3.8/site-packages/pymongo/topology.py", line 238, in _select_servers_loop

  raise ServerSelectionTimeoutError(

pymongo.errors.ServerSelectionTimeoutError: cluster0-shard-00-01.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108),cluster0-shard-00-02.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108),cluster0-shard-00-00.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108), Timeout: 30s, Topology Description: <TopologyDescription id: 62e05c02dfa58fc6054c5f08, topology_type: ReplicaSetNoPrimary, servers: [<ServerDescription ('cluster0-shard-00-00.2co42.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-00.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')>, <ServerDescription ('cluster0-shard-00-01.2co42.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-01.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')>, <ServerDescription ('cluster0-shard-00-02.2co42.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-02.2co42.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')>]>