… while calling the 'throw' builtin
         at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/builder/ofborg-core/pkgs/top-level/aliases.nix:873:12:
          872|   hacpack = throw "hacpack has been removed from nixpkgs, as it has been taken down upstream"; # Added 2025-09-26
          873|   hap-py = throw "hap-py has been removed from nixpkgs, as it is unmaintained upstream, and is failing to build"; # Added 2026-02-15
             |            ^
          874|   harmony-music = throw "harmony-music is unmaintained and has been removed"; # Added 2025-08-26

       error: hap-py has been removed from nixpkgs, as it is unmaintained upstream, and is failing to build