IndentationError: unindent does not match any outer indentation level

This error occurs when there is a mismatch in the indentation level of a block of code in Python. For example, if a block of code is indented by 4 spaces, but another block within it is indented by only 2 spaces, this error will occur.

Here's an example of code that would trigger this error:

def my_function():
    if True:
        print("Hello, world!")
    print("Goodbye, world!")

In the above example, the second print statement is not indented at the same level as the first one, causing the error.

To fix this, you need to make sure that all lines of code within the same block are indented at the same level.

def my_function():
    if True:
        print("Hello, world!")
        print("Goodbye, world!")

This way, the second print statement is indented at the same level as the first one, and the error will be resolved.