UndefinedError: 'current_user' is undefined

you should register login_manager in init.pytry to add this

login_manager.init_app(app)

python jinja2 blueprint flask

The place where you added LoginManager init.py or app.py

login_manager = LoginManager() #Added this line fixed the issue.login_manager.init_app(app) login_manager.login_view = 'users.login'

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