neo4j - Neo4j Python ドライバーでトランザクションを書き込むときの例外: "neo4j.exceptions.AuthError: {code: None} {message: None}"

Question

ドキュメントに記載されている例を実行しようとしています - https://neo4j.com/developer/python/#_resources

class HelloWorldExample:

    def __init__(self, uri, user, password):
        self.driver = GraphDatabase.driver(uri, auth=(user, password))

    def close(self):
        self.driver.close()

    def print_greeting(self, message):
        with self.driver.session() as session:
             greeting = session.write_transaction(self._create_and_return_greeting, message)
             print(greeting)

    @staticmethod
    def _create_and_return_greeting(tx, message):
        result = tx.run("CREATE (a:Greeting) "
                    "SET a.message = $message "
                    "RETURN a.message + ', from node ' + id(a)", message=message)
        return result.single()[0]


if __name__ == "__main__":
    greeter = HelloWorldExample("bolt://localhost:7687", "neo4j", "password")
    greeter.print_greeting("hello, world")
    greeter.close()

エラーは -

Traceback (most recent call last):
  File "createneodb.py", line 26, in <module>
    greeter.print_greeting("hello, world")
  File "createneodb.py", line 13, in print_greeting
    greeting = session.write_transaction(self._create_and_return_greeting, message)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 435, in write_transaction
    return self._run_transaction(WRITE_ACCESS, transaction_function, *args, **kwargs)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 336, in _run_transaction
    self._open_transaction(access_mode=access_mode, database=self._config.database, metadata=metadata, timeout=timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 271, in _open_transaction
    self._connect(access_mode=access_mode, database=database)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 122, in _connect
    bookmarks=self._bookmarks
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 805, in acquire
    return self._acquire(self.address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 660, in _acquire
    connection = self.opener(address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 789, in opener
    **pool_config
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 340, in open
    connection.hello()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 98, in hello
    self.fetch_all()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 517, in fetch_all
    detail_delta, summary_delta = self.fetch_message()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 271, in fetch_message
    response.on_failure(summary_metadata or {})
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_common.py", line 202, in on_failure
    raise AuthError(message)
neo4j.exceptions.AuthError: {code: None} {message: None}

詳細：

ドライバー オブジェクトとセッション オブジェクトが正常に初期化されました。ただし、問題はwrite_transactionを呼び出すときです。問題の原因を理解できません。