"The following argument was not expected: create" when creating environment

[MarcoGorelli]

Some people are reporting issues creating a development environment, and that

mamba env create

gives

The following argument was not expected: create

I don't know if this is platform-specific, but it works for me on mamba 1.0.0 on Linux (WSL2).

The following seems to be working for people

mamba create --file environment.yml

We'll see at the pydataglobal sprint if the above works for everyone, and then we'll update the docs - in the meantime, this might help anyone for whom mamba env create isn't working

cc @datapythonista in case this is something you've come across

[datapythonista]

I've been using the command in Linux for a long time without issues. No idea what the problem can be.

[mgotrik]

I had something like this happen to me recently. The problem was that I had multiple versions of conda (mamba or some other package in your case). One in my local environment and one in the global. Try cleaning/updating all your packages

[emma-carballal]

take

[MarcoGorelli]

hi @emma-carballal - did mamba create --file environment.yml work for you?

[emma-carballal]

hi @MarcoGorelli , I got this with the original:

(pandas-dev) ➜  pandas-carballal git:(main) mamba env create 

CondaValueError: prefix already exists: /Users/nineve/opt/miniconda3/envs/pandas-dev

mamba create --file environment.yml creates an environment successfully.