#### MCVE Code Sample <!-- In order for the maintainers to efficiently understand and prioritize issues, we ask you post a "Minimal, Complete and Verifiable Example" (MCVE): http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports --> Following the [contributing to xarray guidelines](http://xarray.pydata.org/en/stable/contributing.html#creating-a-python-environment) I tried to create the xarray-test environment as follows: ```bash # Create and activate the build environment conda env create -f ci/requirements/py36.yml ``` #### Expected Output Creates conda environment, such that `conda activate xarray-tests` can be used to activate it. #### Problem Description <!-- this should explain why the current behavior is a problem and why the expected output is a better solution --> The creation of the conda environment fails, indicating `ResolvePackageNotFound ` error: ```bash Collecting package metadata: done Solving environment: failed ResolvePackageNotFound: - pynio - cdms2 ``` After some searching I tried to first create the conda environment and subsequently updating it ```bash conda env update -f ci/requirements/py36.yml ``` but this resulted in the same error: ```bash Collecting package metadata: done Solving environment: failed ResolvePackageNotFound: - pynio - cdms2 ``` #### Output of ``xr.show_versions()`` Doesn't make sense for this issue, does it?