error:
       … while calling the 'head' builtin
         at /nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/lib/attrsets.nix:1574:11:
         1573|         || pred here (elemAt values 1) (head values) then
         1574|           head values
             |           ^
         1575|         else

       … while evaluating the attribute 'value'
         at /nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/lib/modules.nix:846:9:
          845|     in warnDeprecation opt //
          846|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          847|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.open-webui.serviceConfig':

       … while evaluating definitions from `/nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/nixos/modules/services/misc/open-webui.nix':

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

       error: Package ‘python3.12-torch-2.5.1’ in /nix/store/hjb1rqv2mfs5ny47amj2gsc8xk05x5g6-source/pkgs/development/python-modules/torch/default.nix:664 is marked as broken, refusing to evaluate.

       a) To temporarily allow broken packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_BROKEN=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowBroken = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowBroken = true; }
       to ~/.config/nixpkgs/config.nix.