TypeError: 'numpy.ndarray' object is not callable

This error occurs when you try to call a numpy array as if it were a function.

For example, suppose you have a numpy array `arr` and you try to call it like a function:

arr(3)

This will raise the error "TypeError: 'numpy.ndarray' object is not callable", because `arr` is not a function and cannot be called.

To fix this error, make sure you are using the correct syntax for accessing elements in a numpy array. To access the element at index 3, you should use square brackets:

arr[3]