执行命令python manage.py db migrate后出错，前面的步骤都跟上了，求解！

错误如下：

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "manage.py", line 26, in <module>

    manager.run()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\flask_script\__init__.py", line 417, in run

    result = self.handle(argv[0], argv[1:])

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\flask_script\__init__.py", line 386, in handle

    res = handle(*args, **config)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\flask_script\commands.py", line 216, in __call__

    return self.run(*args, **kwargs)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\flask_migrate\__init__.py", line 197, in migrate

    version_path=version_path, rev_id=rev_id)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\alembic\command.py", line 176, in revision

    script_directory.run_env()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\alembic\script\base.py", line 427, in run_env

    util.load_python_file(self.dir, 'env.py')

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\alembic\util\pyfiles.py", line 81, in load_python_file

    module = load_module_py(module_id, path)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\alembic\util\compat.py", line 83, in load_module_py

    spec.loader.exec_module(module)

  File "<frozen importlib._bootstrap_external>", line 728, in exec_module

  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

  File "migrations\env.py", line 87, in <module>

    run_migrations_online()

  File "migrations\env.py", line 72, in run_migrations_online

    connection = engine.connect()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2102, in connect

    return self._connection_cls(self, **kwargs)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 90, in __init__

    if connection is not None else engine.raw_connection()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2188, in raw_connection

    self.pool.unique_connection, _connection)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2162, in _wrap_pool_connect

    e, dialect, self)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 1476, in _handle_dbapi_exception_noconnection

    exc_info

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\util\compat.py", line 203, in raise_from_cause

    reraise(type(exception), exception, tb=exc_tb, cause=cause)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\util\compat.py", line 186, in reraise

    raise value.with_traceback(tb)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2158, in _wrap_pool_connect

    return fn()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 345, in unique_connection

    return _ConnectionFairy._checkout(self)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 784, in _checkout

    fairy = _ConnectionRecord.checkout(pool)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 532, in checkout

    rec = pool._do_get()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 1280, in _do_get

    return self._create_connection()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 350, in _create_connection

    return _ConnectionRecord(self)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 477, in __init__

    self.__connect(first_connect_check=True)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\pool.py", line 667, in __connect

    connection = pool._invoke_creator(self)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\strategies.py", line 106, in connect

    return dialect.connect(*cargs, **cparams)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\sqlalchemy\engine\default.py", line 410, in connect

    return self.dbapi.connect(*cargs, **cparams)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\pymysql\__init__.py", line 90, in Connect

    return Connection(*args, **kwargs)

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\pymysql\connections.py", line 699, in __init__

    self.connect()

  File "X:\Users\Administrator\Desktop\python\29\Travel\venv\lib\site-packages\pymysql\connections.py", line 967, in connect

    raise exc

sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on '127.0.0.1' ([WinError 10061] 由于目标计算机积极拒绝，无法连接。)") (Background on this error at: http://sqlalche.me/e/e3q8)