Error: local variable 'image' referenced before assignment

This error occurs when a variable is used before it is assigned a value. For example:

def process_image():
    if some_condition:
        image = load_image()
    resize_image(image)

process_image()

In this code, if `some_condition` is not true, then the `image` variable is never assigned a value. However, it is still referenced in the `resize_image()` function, which causes a `NameError` because `image` is not defined in that case.

To fix this error, you can either assign a default value to the variable before the `if` statement or handle the case where the variable is not assigned a value. For example:

def process_image():
    image = None
    if some_condition:
        image = load_image()
    if image is not None:
        resize_image(image)

process_image()

In this code, the `image` variable is assigned a default value of `None` before the `if` statement, so it is always defined. Then, we check if `image` is not `None` before calling the `resize_image()` function.