Conda can't install packages

Question

I'm trying to follow This guide to install Brian2. I can create and activate the virtual environment but from step 3 I'm not able to install the packages.

I was trying to install with :

conda install numpy scipy jupyter matplotlib mpmath setuptools setuptools_scm mock nose

and the error I get is:

Solving environment: failed
    PackagesNotFoundError: The following packages are not available from current channels:
    - python=3.1
    Current channels:
  - https://repo.anaconda.com/pkgs/main/win-32
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/free/win-32
  - https://repo.anaconda.com/pkgs/free/noarch
  - https://repo.anaconda.com/pkgs/r/win-32
  - https://repo.anaconda.com/pkgs/r/noarch
  - https://repo.anaconda.com/pkgs/pro/win-32
  - https://repo.anaconda.com/pkgs/pro/noarch
  - https://repo.anaconda.com/pkgs/msys2/win-32
  - https://repo.anaconda.com/pkgs/msys2/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

How do i solve this problem?