hi @riccardopinosio,
Thanks for your question.
I'm fairly certain yes, it's because you're using an older version of Prodigy (v1.12.7). The problem is in v1.14.0 we switched our CLI to radicli from plac and the Arg it's looking for is from radicli. You could try to install radicli since it's open source (pip install radicli).
But this still wouldn't read from prodigy.core -- you'd need to refactor this to import directly from radicli. I would also expect since we've made a ton of new updates too, you may hit other issues like this so it would require more refactoring.
Unfortunately, we decided with the plugins that we can only maintain with the most recent version of Prodigy. So at least for this, your best option is to install the latest version of Prodigy. Thanks for understanding!