error:
       … while evaluating a branch condition
         at «string»:23:10:
           22|     if !keepName n then {}
           23|     else if !builtins.isAttrs c || isDrv c then c
             |          ^
           24|     else if c ? _type || !(c.recurseForDerivations or true) then {}

       … in the left operand of the OR (||) operator
         at «string»:23:33:
           22|     if !keepName n then {}
           23|     else if !builtins.isAttrs c || isDrv c then c
             |                                 ^
           24|     else if c ? _type || !(c.recurseForDerivations or true) then {}

       … while evaluating definitions from `/nix/store/lrxvs4l9bqbgjfz7w9bkfg5zqq442jxc-source/modules/transposition.nix':

       … while evaluating definitions from `/nix/store/08z84w85zlhmb738236n584ysbdagcx4-source/checks/flake-module.nix, via option perSystem':

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

       … while evaluating definitions from `/nix/store/p17akwn814w226jq2cdkkhcw4psb0ga9-source/nixos/modules/system/activation/top-level.nix':

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

       error:
       Failed assertions:
       - Your system configures nixpkgs with an externally created instance.
       `nixpkgs.config` options should be passed when creating the instance instead.

       Current value:
       {
         imports = [
           {
             _file = "/nix/store/i5gf7szs3w37pf4832nn7fh2y0dkylkv-source/modules/clan/module.nix, via option flake.clan.inventory.nixpkgs.default.config";
             imports = [
               {
                 allowUnfree = true;
               }
             ];
           }
         ];
       }

       Defined in:
         - /nix/store/p17akwn814w226jq2cdkkhcw4psb0ga9-source/flake.nix