Poetry configuration is invalid - Additional properties are not allowed ('group' was unexpected)

Recently, I faced this issue with Poetry. All my commands using poetry were failing with the following error.

RuntimeError

  The Poetry configuration is invalid:
    - Additional properties are not allowed ('group' was unexpected)

I figured out the following issue.

1. The code owners had updated the poetry core requirement to requires = ["poetry-core>=1.2.0"]
2. My current poetry version was 1.1.12

I did the following to fix my issue.

# remove the current poetry installation
rm -rf /Users/myusername/.poetry

# upgrade poetry version
pip install poetry -U

This should solve the problem. I verified the same by running my other poetry commands.

It should be noted that your current poetry configurations will be lost while doing this, and would need to be recreated and reinstalled.

# reinstall poetry for my project
poetry install