ModuleNotFoundError: No module named 'ruamel'

This error message indicates that the Python interpreter is unable to find the 'ruamel' module. This could be due to one of several reasons:

1. The 'ruamel' module is not installed on your system. You can install it using pip or another package manager. For example, you can run the command 'pip install ruamel.yaml' to install the ruamel.yaml package.

2. The 'ruamel' module is installed, but it is not accessible to the Python interpreter. This could happen if the module is installed in a location that is not in the PYTHONPATH environment variable or if you are using a virtual environment and the module is not installed in it.

3. There may be a typo in the import statement, or the module may have been renamed or removed in a newer version of the package.

To resolve this error, you should first check if the 'ruamel' module is installed on your system and if not, install it using pip. If it is already installed, check that it is accessible to the Python interpreter and that there are no typos in the import statement.