Flask Error : AttributeError: 'Flask' object has no attribute 'login_manager'

##  Error
  File "/opt/homebrew/lib/python3.11/site-packages/flask_login/utils.py", line 372, in _get_user
    current_app.login_manager._load_user()
    ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Flask' object has no attribute 'login_manager'

 

 

Flask __init__.py에 LoginManaer  명시 문제

# in __init__.py create_app()

# flask-login 적용
login_manager = LoginManager()
login_manager.login_view = 'auth.sign_in'
login_manager.init_app(app)