error:
       … while calling the 'derivationStrict' builtin
         at «nix-internal»/derivation-internal.nix:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'nixos-system-eientei-26.11.20261020.02c087f'
         whose name attribute is located at «github:nixos/nixpkgs/02c087f3fe673c9e317f206a627cb6b910336dbe?narHash=sha256-IoNisKcGbUjdd45qCqywGMCYmZ5EnkxezvLII0FWwNA%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'buildCommand' of derivation 'nixos-system-eientei-26.11.20261020.02c087f'
         at «github:nixos/nixpkgs/02c087f3fe673c9e317f206a627cb6b910336dbe?narHash=sha256-IoNisKcGbUjdd45qCqywGMCYmZ5EnkxezvLII0FWwNA%3D»/nixos/modules/system/activation/top-level.nix:63:7:
           62|       allowSubstitutes = false;
           63|       buildCommand = systemBuilder;
             |       ^
           64|

       … while evaluating the option `systemd.units."watt.service".text':

       … while evaluating definitions from `/nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/nixos/modules/system/boot/systemd.nix':

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

       error: The option `systemd.services.watt.environment.WATT_CONFIG' has conflicting definition values:
       - In `/nix/store/vkslkxzzlzqhzsvrdfhfjb8f5ba1ar1g-source/modules/programs/watt': "/etc/watt.toml"
       - In `/nix/store/vkslkxzzlzqhzsvrdfhfjb8f5ba1ar1g-source/modules/programs/watt': <derivation watt-config.toml>
       Use `lib.mkForce value` or `lib.mkDefault value` to change the priority on any of these definitions.