Unable to create python 27 project - build fails!

General
1

I tried both starting from a blank template as well as python 3, then modified it to a python 2.7 using the below file, it was failing at rebuild: Building environment - Couldn't build your environment. Launch the default recovery environment below.

# To learn more about how to use Nix to configure your environment
# see: https://firebase.google.com/docs/studio/customize-workspace
{ pkgs, ... }: {
  # Which nixpkgs channel to use.
  channel = "stable-24.05"; # or "unstable"
  # Use https://search.nixos.org/packages to find packages
  packages = [
    pkgs.python27
    pkgs.python27Packages.pip 
    # pkgs.go
    # pkgs.python311
    # pkgs.python311Packages.pip
  ];
  # Sets environment variables in the workspace
  env = {};
  idx = {
    # Search for the extensions you want on https://open-vsx.org/ and use "publisher.id"
    extensions = [
      "ms-python.python"
      # "vscodevim.vim"
    ];
    # Enable previews
    previews = {
      enable = true;
      previews = {
        # web = {
        # };
      };
    };
    # Workspace lifecycle hooks
    workspace = {
      # Runs when a workspace is first created
      onCreate = {
        install =
          "virtualenv .venv -p python2.7 && source .venv/bin/activate && pip install -r requirements.txt";
        # Open editors for the following files by default, if they exist:
        default.openFiles = [ "README.md" ];
      };
      # Runs when the workspace is (re)started
      onStart = {
        # Example: start a background task to watch and re-build backend code
        # watch-backend = "npm run watch-backend";
      };
    };
  };
}