Error: … while evaluating the attribute 'config'

First day with NixOS…
All was going awesomely well until I did

sudo nixos-rebuild switch

and I got

error:
       … while evaluating the attribute 'config'

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:9:

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

       … while calling the 'seq' builtin

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:18:

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

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

       error: syntax error, unexpected end of file, expecting ';'

       at /etc/nixos/configuration.nix:154:2:

          153|
          154| }
             |  ^
          155|
building Nix...
error:
       … while evaluating the attribute 'config'

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:9:

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

       … while calling the 'seq' builtin

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:18:

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

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

       error: syntax error, unexpected end of file, expecting ';'

       at /etc/nixos/configuration.nix:154:2:

          153|
          154| }
             |  ^
          155|
building the system configuration...
error:
       … while evaluating the attribute 'config.system.build.toplevel'

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:9:

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

       … while calling the 'seq' builtin

         at /nix/store/d6vnw6w0bvf24xxkn29pk1gnz0w610q9-nixos-23.11/nixos/lib/modules.nix:320:18:

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

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

       error: syntax error, unexpected end of file, expecting ';'

       at /etc/nixos/configuration.nix:154:2:

          153|
          154| }
             |  ^
          155|

This happened after I was trying to mount NTFS partitions, and enable NTFS support.

My config:

# 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
    ];

  # 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 GNOME Desktop Environment.
  services.xserver.displayManager.gdm.enable = true;
  services.xserver.desktopManager.gnome.enable = true;

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

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

  # 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;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.shmuel = {
    isNormalUser = true;
    description = "shmuel";
    extraGroups = [ "networkmanager" "wheel" ];
    packages = with pkgs; [
      firefox
    #  thunderbird
    ];
  };
  
 # 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.google-chrome
  pkgs.dconf
  pkgs.papirus-icon-theme
  pkgs.caffeine-ng
  pkgs.gnome.gnome-tweaks
  pkgs.gnome-extension-manager
  pkgs.audacious
  pkgs.timeshift
  pkgs.gnome.gnome-disk-utility
  pkgs.gparted
  pkgs.gedit
  
  #gnome extensions
    pkgs.gnomeExtensions.dash-to-panel
  pkgs.gnomeExtensions.date-menu-formatter
  pkgs.gnomeExtensions.extension-list
  pkgs.gnomeExtensions.media-controls
  pkgs.gnomeExtensions.desktop-icons-ng-ding
  pkgs.gnomeExtensions.appindicator
  pkgs.gnomeExtensions.clipboard-indicator
  pkgs.gnomeExtensions.arcmenu
  ];

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };
  
  # List services that you want to enable:

  # 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?

}

That is actually the issue ^^

It looks like you missed closing this.

How did you figure out where in the file the error was?

Just eyeballed it. Noticed there was a de-dent without a closing }, so either a really bad format, or that was the missing spot.

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