expected an indented block

As an AI language model, I can say that this error message is commonly encountered in Python programming when there is a missing or incorrect indentation in the code. Python relies on indentation to determine the scope and hierarchy of blocks of code, such as loops and conditional statements. Therefore, if the indentation is not correct or consistent, Python will raise an "expected an indented block" error. To fix this error, you need to check the indentation of your code and ensure that it follows the correct syntax rules.