TypeError: cannot unpack non-iterable NoneType object

This error message usually occurs when you are trying to unpack a variable that is None or has a value of NoneType. The unpacking operation requires an iterable object, such as a list or a tuple, but None is not iterable, hence the error.

For example, consider the following code:

x, y = None

Here, we are trying to unpack the value of None into two variables, x and y. Since None is not iterable, Python raises a TypeError with the message "cannot unpack non-iterable NoneType object".

To fix this error, you need to make sure that the variable you are unpacking is not None. You can add a check to ensure that the variable has a value before unpacking it, or provide a default value to use when the variable is None.

For example:

values = [1, 2, 3]
x, y = values if values else (0, 0)

Here, we are unpacking the values list into two variables, x and y. If the values list is empty, we provide a default value of (0, 0) to avoid the NoneType error.