AttributeError: 'tuple' object has no attribute 'lower'

This error occurs when you try to call the lower() method on a tuple object. The lower() method is used to convert a string to lowercase, but tuples do not have this method because they are immutable sequences of objects.

To fix this error, you need to make sure that you are calling the lower() method on a string object, not a tuple object. Check your code to see if you are inadvertently trying to call the lower() method on a tuple.