ModuleNotFoundError: No module named 'py'

This error message is indicating that Python is unable to find a module called 'py'. This error can occur for various reasons, some of the common ones are:

1. The module is not installed: If the module 'py' is not installed on your system, you will get this error message. You can install the module using pip, which is a package manager for Python.

2. The module is installed in the wrong location: Sometimes, the module is installed in a location that Python is not checking for modules. In such cases, you can try to reinstall the module or add the module's location to the PYTHONPATH environment variable.

3. Typing mistake: It's possible that you might have misspelled the module name in your code, which is causing the error.

To resolve this error, you should check your code for any spelling mistakes, make sure that the module is installed correctly, and that it is in the correct location.