IndentationError :expected an indented block

This error message typically occurs in Python when you forget to indent the code block after a statement that requires indentation. Indentation is crucial in Python as it determines the structure and flow of the code.

To fix this error, you need to make sure that you properly indent the block of code that comes after the statement that triggers the error. Here is an example:

if condition:
    # code block that should be indented
    print("Indented code block")
else:
    print("Non-indented code block")

In the above example, the statements inside the `if` and `else` blocks are indented by four spaces or a tab. Ensure that you are consistent with your indentation style throughout your code.