IndentationError: expected an indented block after function definition on line 6

This error occurs when there is a function definition (or any block of code that requires indentation) but there is no indentation following it. In Python, indentation is used to define blocks of code, such as function bodies, loop bodies, and conditional statements.

To fix this error, you need to add an indented block of code after the function definition. For example:

def my_function():
    print("Hello world!")  # This line needs to be indented

my_function()  # Call the function

In this example, the `print` statement needs to be indented after the `def` statement to indicate that it is part of the function body.