Error: cannot look up '<home-manager>' in pure evaluation mode

I am getting the error in the subject line when I rebuild.
Here is the full output:

sudo nixos-rebuild switch --flake . --option eval-cache false
error:
       … while calling the 'seq' builtin

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       … while evaluating a branch condition

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/lib/modules.nix:261:9:

          260|       checkUnmatched =
          261|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |         ^
          262|           let

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

       error: cannot look up '<home-manager>' in pure evaluation mode (use '--impure' to override)

       at «none»:0: (source not available)

This happened while trying to set up home manager.
flake.nix:

{
    inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, home-manager }: {

    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
      ./configuration.nix
      <home-manager>
  {
    home-manager.useGlobalPkgs = true;
    home-manager.useUserPackages = true;
    home-manager.users.shmuel = import ./home.nix;
  }
      ];

    };
  };
}

home.nix:

home-manager.users.shmuel = { pkgs, ... }: {
  home.username = "shmuel";
  home.homeDirectory = "/home/shmuel";
  programs.home-manager.enable = true;
  home.packages = with pkgs; [
    # your desired nixpkgs here
    pkgs.oh-my-zsh
  ];

configuration.nix:

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
         ./hardware-configuration.nix
 ];

# Enable the Flakes feature and the accompanying new nix command-line tool
  nix.settings.experimental-features = [ "nix-command" "flakes" ];

    hardware.sane.enable = true; # enables support for SANE scanners

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  networking.hostName = "nixos"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Enable networking
  networking.networkmanager.enable = true;

  # Set your time zone.
  time.timeZone = "Asia/Jerusalem";

  #local time
  time.hardwareClockInLocalTime = true;

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_US.UTF-8";
    LC_IDENTIFICATION = "en_US.UTF-8";
    LC_MEASUREMENT = "en_US.UTF-8";
    LC_MONETARY = "en_US.UTF-8";
    LC_NAME = "en_US.UTF-8";
    LC_NUMERIC = "en_US.UTF-8";
    LC_PAPER = "en_US.UTF-8";
    LC_TELEPHONE = "en_US.UTF-8";
    LC_TIME = "en_US.UTF-8";
  };

  # Enable the X11 windowing system.
  services.xserver.enable = true;

  # Enable the KDE Plasma Desktop Environment.
  services.xserver.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;

  # Configure keymap in X11
  services.xserver = {
   xkb.layout = "us";
    xkb.variant = "";
  };

  # Enable CUPS to print documents.
  services.printing.enable = true;

 #Brother printer
  services.printing.drivers = [
    pkgs.brlaser
    pkgs.brgenml1lpr
    pkgs.brgenml1cupswrapper
];

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    # If you want to use JACK applications, uncomment this
    #jack.enable = true;

    # use the example session manager (no others are packaged yet so this is enabled by default,
    # no need to redefine it in your config for now)
    #media-session.enable = true;
  };

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

#NTFS
  boot.supportedFilesystems = [ "ntfs" ];

  #Automount

  fileSystems."/run/media/shmuel/Timeshift" = {
       device = "/dev/disk/by-uuid/701FE3AE54D4CE16";
};

fileSystems."/run/media/shmuel/VM" = {
    device = "/dev/disk/by-uuid/f8c56958-b308-4a9c-a8e6-f2ba9a148860";
};

fileSystems."/run/media/shmuel/PersonalData" = {
    device = "/dev/disk/by-uuid/22EC446AEC4439F5";
};

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.shmuel = {
    isNormalUser = true;
    description = "shmuel";
    extraGroups = [ "networkmanager" "wheel" "vboxusers" "scanner" "lp" ];
    packages = with pkgs; [
      firefox
      kate
    #  thunderbird
    ];
  };

#Shell
  users.users.shmuel.shell = pkgs.zsh;

  #Automatic updates
  system.autoUpgrade.enable  = true;
  system.autoUpgrade.allowReboot  = false;

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  #  wget
  pkgs.deja-dup
  pkgs.ntfs3g
  pkgs.google-chrome
  pkgs.caffeine-ng
  pkgs.audacious
  pkgs.timeshift
  pkgs.gparted
  pkgs.neofetch
  pkgs.lolcat
  pkgs.conky
  pkgs.goldendict-ng
  pkgs.losslesscut-bin
  pkgs.vlc
  pkgs.smplayer
  pkgs.libreoffice
  pkgs.handbrake
  pkgs.media-downloader
  pkgs.inxi
  pkgs.kio-admin
  pkgs.zram-generator
  pkgs.xfce.mousepad
  pkgs.konsave
  pkgs.simple-scan
  pkgs.git
  pkgs.vim
  pkgs.wget
  pkgs.curl
  pkgs.xpad

];

  environment.plasma5.excludePackages = with pkgs.libsForQt5; [
  plasma-browser-integration
  oxygen
];

  virtualisation.virtualbox.host.enable = true;
  virtualisation.virtualbox.host.enableExtensionPack = true;

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
    programs.zsh.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # List services that you want to enable:

  services.flatpak.enable = true;
  services.avahi.enable = true;

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "23.11"; # Did you read the comment?

}

# Set channel by running this command:
# sudo nix-channel --add https://channels.nixos.org/nixos-unstable
# sudo nix-channel --update

# Configure printer:
# ipp://192.168.150.170:631
# Brother MFC-L2710DW series, using brlaser v6

I did it with --impure and I got

sudo nixos-rebuild switch --flake . --impure
[sudo] password for shmuel: 
error:
       … while calling the 'seq' builtin

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       … while evaluating a branch condition

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/lib/modules.nix:261:9:

          260|       checkUnmatched =
          261|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |         ^
          262|           let

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

       error: function 'anonymous lambda' called with unexpected argument 'lib'

       at /nix/store/wxkaa1wg7pm93fsy5vr8k9ivnzbqhnz1-home-manager/home-manager/default.nix:1:1:

            1| { pkgs ? import <nixpkgs> { } }:
             | ^
            2|

Hi

Use “home-manager.nixosModules.home-manager” instead of <home-manager> in your modules

1 Like

I made the correction, now I get a different error:

building the system configuration...
error:
       … while calling the 'head' builtin

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/lib/attrsets.nix:960:11:

          959|         || pred here (elemAt values 1) (head values) then
          960|           head values
             |           ^
          961|         else

       … while evaluating the attribute 'value'

         at /nix/store/bg5fbkfa5x53clcjf4p5p92k1l3w8x38-source/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: syntax error, unexpected '=', expecting end of file

       at /nix/store/ny3wmc8rkzlzkz3rrh14v6qivf9vks3s-source/home.nix:1:27:

            1| home-manager.users.shmuel = { pkgs, ... }: {
             |                           ^
            2|   home.username = "shmuel";

home.nix should be

{ pkgs, ... }: {
  home.username = "shmuel";
  home.homeDirectory = "/home/shmuel";
  programs.home-manager.enable = true;
  home.packages = with pkgs; [
    oh-my-zsh
  ];
} 

good tutorial
Getting Started with Home Manager | NixOS & Flakes Book (thiscute.world)

I got the error stateVersion is used but not defined
So I also needed to add this to configuration.nix

home-manager.users.shmuel = {
     home.stateVersion = "23.11";
  };

It refused to accept home.stateVersion = "unstable" so I stated it as "23.11"

This was based on