$ conda env create -f environment.yml
Fetching package metadata ...
CondaHTTPError: HTTP 401 UNAUTHORIZED for url <https://conda.anaconda.org/t/ab-06078159-d66e-4f49-af31-35a1db259db2/menpo/linux-64/repodata.json>
Elapsed: 00:00.646584
The remote server has indicated you are using invalid credentials for this channel.
If the remote site is anaconda.org or follows the Anaconda Server API, you
will need to
(a) login to the site with `anaconda login`, or
(b) provide conda with a valid token directly.
Further configuration help can be found at <https://conda.io/docs/config.html>.