So I'm trying to set a plugin config via the CLI, and the value is a list of objects, but I keep getting this error:

argument type <class 'list'> is not in the flattenalbe types (<class 'collections.abc.Mapping'>,)

@michael_cooper That looks like a bug! Can you please create an issue with the exact command you're running and the full stacktrace of the error? You may need to run with

meltano --log-level=debug

to get it to show up

Weird, it's working now, and I'm not sure what I changed...

Hmm, odd 😕

Adding my experience in case someone hits this in the future. I ran into the the "flattenable" error as well, though mine was for

<class 'ruamel.yaml.comments.CommentedSeq'>

when running either

meltano run

or

meltano install

. I installed the the YAML extension in VS Code. It's linter found my formatting issue instantly!