Hello : anyone here is acquainted with and can help with sixos ? -- https://codeberg.org/amjoseph/six-demo

nix run --impure -f six-demo host.demo.configuration.vm

With :
nix run --impure -f six-demo host.demo.configuration.vm

I end up with the following :

error:
       … while calling the 'import' builtin
         at /etc/nixos/six-demo/sixos/default.nix:9:5:
            8|   lib
            9|   ? import "${nixpkgs-path}/lib",
             |     ^
           10|

       … while realising the context of a path

       … while calling the 'fetchTarball' builtin
         at /etc/nixos/six-demo/sixos/default.nix:3:5:
            2|   nixpkgs-path
            3|   ? builtins.fetchTarball {
             |     ^
            4|     url = "https://github.com/nixos/nixpkgs/archive/38edd08881ce4dc24056eec173b43587a93c990f.tar.gz";

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: cannot read file 'nixpkgs-38edd08881ce4dc24056eec173b43587a93c990f/pkgs/build-support/vm/default.nix' from tarball```