Web Reference: If someone gets similar error with Flask-Login: current_user.is_authenticated(): TypeError: 'bool' object is not callable refer to this question. You do cls.isFilled = True. That overwrites the method called isFilled and replaces it with the value True. That method is now gone and you can't call it anymore. Dec 4, 2025 · Learn how to resolve the Python TypeError 'bool' object is not callable by understanding common causes like variable name conflicts and using parentheses incorrectly. The TypeError: 'bool' object is not callable is a common error in Python indicating that you've attempted to use parentheses () to call something that holds a boolean value (True or False) as if it were a function. Functions and methods are callable, but simple boolean values are not.
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