IndentationError: expected an indented block

This error occurs in Python when you have a statement that requires indentation, such as a function or loop, but you have not properly indented the subsequent block of code.

For example:

def my_function():
print("Hello, world!")

In this code, the `print` statement should be indented to be included within the function block. To fix the error, you would add the necessary indentation:

def my_function():
    print("Hello, world!")

It is important to note that Python relies on indentation to determine the structure of your code, so proper indentation is crucial to avoid this error and ensure your code runs correctly.