ImportError: attempted relative import with no known parent package

This error occurs when you try to use a relative import in a module that has no known parent package.

For example, let's say you have the following directory structure:

my_project/
    main.py
    utils/
        helper.py

If you want to import `helper.py` into `main.py`, you might try to use a relative import like this:

from .utils.helper import my_function

However, this will result in the `ImportError: attempted relative import with no known parent package` error because `main.py` has no parent package.

To fix this error, you can either:

1. Use an absolute import instead:

from my_project.utils.helper import my_function

2. Turn `my_project` into a package by adding an empty `__init__.py` file to the root directory:

my_project/
    __init__.py
    main.py
    utils/
        helper.py

Then you can use the relative import as originally intended:

from .utils.helper import my_function