python 3.9 numpy pandas error

[pannet1]

hi,
i am using the below flake. my goal is just install numpy and pandas on python3.9 for now. i am on latest stable nix. i am getting segmentation when you run python after installation completes without any complaints.

# flake.nix
{
  inputs = {
    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
    systems.url = "github:nix-systems/default";
    devenv.url = "github:cachix/devenv";
    nixpkgs-python.url = "github:cachix/nixpkgs-python";
  };

  nixConfig = {
    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
    extra-substituters = "https://devenv.cachix.org";
  };

  outputs = { self, nixpkgs, devenv, systems, ... } @ inputs:
    let
      forEachSystem = nixpkgs.lib.genAttrs (import systems);
    in
    {
      packages = forEachSystem (system: {
        devenv-up = self.devShells.${system}.default.config.procfileScript;
      });

      devShells = forEachSystem
        (system:
          let
            pkgs = nixpkgs.legacyPackages.${system};
          in
          {
            default = devenv.lib.mkShell {
              inherit inputs pkgs;
              modules = [
                {
                  # https://devenv.sh/reference/options/
                  packages = [ 
                    pkgs.hello
                  ];

                  languages.python = {
                    enable = true;
                    version = "3.9.19";
                    venv = {
                      enable = true;
                      quiet = false;
                    };
                  };
                
                  enterShell = ''
                    hello
                  '';

                  processes.run.exec = "hello";
                }
              ];
            };
          });
    };
}

what is that i am doing wrong here.