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In PyCharm, the warning about being 'not callable' signifies that the code is trying to call something that is not a function or a callable object. It means that the code is attempting to use parentheses to call something that cannot be called, such as a variable that does not refer to a function or an object that does not have a __call__ method. This warning is typically displayed when a syntactical error occurs, and it is essential to rectify it to ensure that the code runs correctly.