I'm on Ubuntu. Rails 6 project. I'm trying to add new packages to my project but it won't accept the yarn install nor yarn add commands.

I tried adding flatpìckr using yarn install flatpickr and it prompted me to use the add command instead

yarn install flatpickr
yarn install v1.22.17
error `install` has been replaced with `add` to add new dependencies. Run "yarn add flatpickr" instead.

However, I get the same message when running the add command:

yarn add flatpickr
yarn install v1.22.17
error `install` has been replaced with `add` to add new dependencies. Run "yarn add flatpickr" instead.

I'm running the latest version of Yarn and I can succesfully run commands like yarn install --checkfiles, I just can't seem to add new ones.