Nixos-rebuild: the reference 'refs/heads/main' cannot be peeled

What does this error mean? and how do i fix it?

I got this when trying to update my flake:

[spiderunderurbed@daspidercave:/etc/nixos]$ sudo nix flake update
[sudo] password for spiderunderurbed: 
error:
       … while fetching the input 'git+file:///etc/nixos'

       error: getting working directory status: the reference 'refs/heads/main' cannot be peeled - Cannot retrieve reference target (libgit2 error code = 3)
[ble: exit 1]


Directory contents:



[spiderunderurbed@daspidercave:/etc/nixos]$ ls
acer-module.nix                                          boot.nix                flake.nix                       home.nix      services                  to-work
acer-predator-turbo-and-rgb-keyboard-linux-module        command.sh              flake.nix.old                   nixos-files   setup.sh                  vfio.nix
acer-predator-turbo-and-rgb-keyboard-linux-module.old    configuration.nix       flatpak.nix                     pkgs          sops-nix
acer-predator-turbo-and-rgb-keyboard-linux-module.old-1  configuration.nix.old   flatpak.nix.old                 README.md     spiderunderurbed
archives                                                 configuration.nix.save  guides                          registry.nix  temporarially-broken.txt
arion-compose.nix                                        expressvpn.nix          hardware-configuration.nix      result        tilers
arion-pkgs.nix                                           flake.lock              hardware-configuration.nix.old  scripts       TODO.md

[spiderunderurbed@daspidercave:/etc/nixos]$ 

All the files require sudo to edit, so owned by the root user

Can you show the contents of this file?

(its a bit messy)

{
  description = "My flake";

  inputs = {
    #    nix-gaming.url = "github:fufexan/nix-gaming";
#    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nix-cachyos-kernel.url = "github:xddxdd/nix-cachyos-kernel";
    nix-flatpak.url = "github:gmodena/nix-flatpak";
    #dont use much
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    lanzaboote = { url = "github:nix-community/lanzaboote/v0.3.0"; };
    hyprland = { url = "github:hyprwm/Hyprland"; };
    #niri = {
    #  url = "github:sodiboo/niri-flake";
    #  inputs.nixpkgs.follows = "nixpkgs";
    #};

    hm-inputs.url = "/home/spiderunderurbed/home-manager";

    # --- 
    # archived
    #arion = {
    #  url = "github:hercules-ci/arion";
    #  inputs.nixpkgs.follows = "nixpkgs";
    #};
    # ---

    sops-nix.url = "github:Mic92/sops-nix";
    sops-nix.inputs.nixpkgs.follows = "nixpkgs";
    chaotic = {
      url = "github:chaotic-cx/nyx/nyxpkgs-unstable";
      #rev = "2ab29fd77896a69a77bb98fd792fb6102f44b449";
      #narHash = "sha256-aYDO6La5fuG5xzVYBFfoheWukwggcyh3LlfI0p+RnHw=";
    };
    nbfc-linux = {
        url = "github:nbfc-linux/nbfc-linux?dir=pkgbuilds/nix";
        inputs.nixpkgs.follows = "nixpkgs";
    };
  
   # nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    stable.url = "github:NixOS/nixpkgs/nixos-24.11";
    auto-cpufreq = {
      url = "github:AdnanHodzic/auto-cpufreq";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    #    envycontrol.url = "github:bayasdev/envycontrol";
    envycontrol.url = "github:SpiderUnderUrBed/envycontrol";
    #lanzaboote = { url = "github:nix-community/lanzaboote/v0.3.0"; };
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };

    nix-software-center.url = "github:snowfallorg/nix-software-center";
    #nixos-cachyos-kernel.url = "github:drakon64/nixos-cachyos-kernel";
    #chaotic.url = "github:chaotic-cx/nyx/nyxpkgs-unstable";

    tagstudio = {
      url = "github:TagStudioDev/TagStudio";
      inputs.nixpkgs.follows = "nixpkgs"; # Use the same package set as your flake.
    };
  };

  outputs = { self, nixpkgs, nix-cachyos-kernel, auto-cpufreq, envycontrol, sops-nix, nix-flatpak,
    #    nix-gaming,
    chaotic, nix-software-center, flake-compat, home-manager, hyprland
    # niri
    , lanzaboote, hm-inputs, ... }@inputs:
    let
      #    home-setup = builtins.getFlake "/home/spiderunderurbed/home-manager"; 
      #    extraSpecialArgs = hm-inputs.outputs.extraSpecialArgs;
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
      lib = nixpkgs.lib;
      gitCredentialManager = import ./spiderunderurbed/gcm.nix {
        #        inherit pkgs;
        pkgs = pkgs;
        lib = pkgs.lib;
        stdenv = pkgs.stdenv;
        fetchFromGitHub = pkgs.fetchFromGitHub;
        dpkg = pkgs.dpkg;
        dotnet-sdk = pkgs.dotnet-sdk;
        buildDotnetModule = pkgs.buildDotnetModule;
        dotnetCorePackages = pkgs.dotnetCorePackages;
        xorg = pkgs.xorg;
        # libICE = pkgs.libICE;
        # libSM = pkgs.libSM;
        fontconfig = pkgs.fontconfig;
        libsecret = pkgs.libsecret;
        git = pkgs.git;
        git-credential-manager = pkgs.git-credential-manager;
        mkShell = pkgs.mkShell;
      };
      hydenixConfig = import ./spiderunderurbed/hydenix/config.nix;
      configLocation = "./";
      # netsecrets = builtins.getFlake "/home/spiderunderurbed/projects/net-secrets";
      #hm-lib = home-manager.lib;
      hm-modules = [
        #        hm-inputs.inputs.sublimation.homeManagerModules.sublimation
        #        hm-inputs.inputs.nixcord.homeManagerModules.nixcord
      ];
      extraSpecialArgs = {
        inherit
        #netsecrets 
          hydenixConfig gitCredentialManager hm-modules configLocation
          home-manager;
        inputs = hm-inputs;
      };
    in {
      formatter.${system} = pkgs.nixpkgs-fmt;
      nixosConfigurations.daspidercave = nixpkgs.lib.nixosSystem {
        inherit system;

        specialArgs = {
          inherit inputs;
          #     netsecrets; 
          #nix-gaming;
        };
        # // extraSpecialArgs;
        modules = [
          sops-nix.nixosModules.sops
          lanzaboote.nixosModules.lanzaboote
          auto-cpufreq.nixosModules.default
          chaotic.nixosModules.default
          #nixos-cachyos-kernel.nixosModules.default
          #home-setup.nixosConfigurations.spiderunderurbed
          #        home-setup.homeConfigurations.spiderunderurbed
          ./vfio.nix
          ./configuration.nix
          ./boot.nix

          ./registry.nix
          ./flatpak.nix

          nix-flatpak.nixosModules.nix-flatpak
          {
            nixpkgs.overlays = [
                nix-cachyos-kernel.overlays.default
            ];
          }
          #home-manager.nixosModules.home-manager
          #     netsecrets.nixosModules.default
          {
            #home-manager.useGlobalPkgs = true;
            #home-manager.useUserPackages = true;
            #          home-manager.sharedModules = [
            #             hm-inputs.inputs.walker.homeManagerModules.default
            #                 hm-inputs.inputs.nixcord.homeManagerModules.nixcord
            #             hm-inputs.inputs.sublimation.homeManagerModules.sublimation
            #             #hm-inputs.inputs.walker
            ##        hm-inputs.inputs.nixcord.homeManagerModules.nixcord
            # 
            #         ];
            # home-manager.extraSpecialArgs = extraSpecialArgs;
            # home-manager.users.spiderunderurbed = { pkgs, ... }: {
            #   #inherit specialArgs;
            #   #inherit extraSpecialArgs; 
            #   imports = [
            #           ./spiderunderurbed/home.nix
            #           #(import ./spiderunderurbed/home.nix {})
            #   ];
            #  };
          }

          {
            #     imports = [ home-setup.homeConfigurations ];
            imports = [
              # spider-config
            ];
            environment.systemPackages = with pkgs;
              [
                #envycontrol.packages.${system}.default
              ];

          }
        ];
      };
    };
}