Installation through configuration.nix fails

[BlueFox1616]

the error :
error:
… while calling the 'head' builtin

     at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:1575:11:

     1574|         || pred here (elemAt values 1) (head values) then
     1575|           head values
         |           ^
     1576|         else

   … while evaluating the attribute 'value'

     at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:809:9:

      808|     in warnDeprecation opt //
      809|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
         |         ^
      810|         inherit (res.defsFinal') highestPrio;

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

   error: attempt to call something which is not a function but a set

   at /etc/nixos/configuration.nix:16:23:

       15| let
       16|   nixos-conf-editor = import (pkgs.fetchFromGitHub {
         |                       ^
       17|     owner = "snowfallorg";

[mainrs]

Can you post your configuration.nix file? At least the parts about how you import and configure/install the program?

[BlueFox1616]

{ config, pkgs, ... }:
let
nix-software-center = import (pkgs.fetchFromGitHub {
owner = "snowfallorg";
repo = "nix-software-center";
rev = "0.1.2";
sha256 = "xiqF1mP8wFubdsAQ1BmfjzCgOD3YZf7EGWl9i69FTls=";
}) {};
in
let
nixos-conf-editor = import (pkgs.fetchFromGitHub {
owner = "snowfallorg";
repo = "nixos-conf-editor";
rev = "0.1.2";
sha256 = "sha256-/ktLbmF1pU3vFHeGooDYswJipNE2YINm0WpF9Wd1gw8=";
}) {};
in
{
imports =
[ # Include the results of the hardware scan.
./hardware-configuration.nix
];
(configuration code)
and then i just added nixos-conf-editor to my pkgs

[vikineema]

I've also experienced the same issue, the configuration file is here:
{ config, pkgs, lib, ... }: let nixos-conf-editor = import (pkgs.fetchFromGitHub { owner = "snowfallorg"; repo = "nixos-conf-editor"; rev = "0.1.2"; sha256 = "sha256-/ktLbmF1pU3vFHeGooDYswJipNE2YINm0WpF9Wd1gw8="; }) {}; in { environment.systemPackages = with pkgs; [ nixos-conf-editor ]; }

[UX0l0l]

same issue here as well. can we get a fix for this?