i’m trying to upgrade to Meltano 3 and I’m having an issue with

meltano install

. I’m getting this error:

Mapper 'meltano-map-transformer' is not known to Meltano. Try running `meltano lock --update --all` to ensure your plugins are up to date.

but I have already run that command, and I do have a lock file for this plugin in

plugins/mappers/meltano-map-transformer--meltano.lock

I’ve had the same issue, but mine fixed by adding the correct plugins and removing plugins/ from .gitignore