Error installing orcaslicer packaged with flake

this is the error I am getting when I run home manager switch and to my understanding it does have the “default” attribute

error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'home-manager-generation'
         whose name attribute is located at /nix/store/0g53xyh39z3y90p4d8r341wbqyjy1zhl-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildCommand' of derivation 'home-manager-generation'

         at /nix/store/0g53xyh39z3y90p4d8r341wbqyjy1zhl-source/pkgs/build-support/trivial-builders/default.nix:98:16:

           97|         enableParallelBuilding = true;
           98|         inherit buildCommand name;
             |                ^
           99|         passAsFile = [ "buildCommand" ]

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

       error: attribute 'default' missing

       at /nix/store/1rnnsw1440l1wbmh7cybq0f76dwywapc-source/home.nix:67:5:

           66|   ] ++ [
           67|     inputs.orca.packages.${system}.default
             |     ^
           68|   ]);

flake.nix

# flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

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

    hyprland.url = "github:hyprwm/Hyprland";

    orca = { url = "github:ovlach/nix-orca-slicer"; };
  };

  outputs = {nixpkgs, home-manager, hyprland, ...}@inputs: {
    homeConfigurations."histic@nixos" = home-manager.lib.homeManagerConfiguration {
      pkgs = nixpkgs.legacyPackages.x86_64-linux;

      modules = [
        hyprland.homeManagerModules.default
        {wayland.windowManager.hyprland.enable = true;}
        ./home.nix
        ./hypr.nix
      ];
    };
  };
}

home.nix

{ config, pkgs, lib, inputs, system, ... }:

let inherit (inputs) orca;



in { 
  nixpkgs = {
    config = {
      allowUnfree = true;
    
      permittedInsecurePackages = [
        "electron-25.9.0"
      ];
    };
  };
  
  home.username = "histic";
  home.homeDirectory = "/home/histic";
  xdg.cacheHome = "/home/histic/.cache";
  xdg.configHome = "/home/histic/.config";
  xdg.dataHome = "/home/histic/.local/share";
  
  home.stateVersion = "23.11";
  
  home.packages = with pkgs; ([
    firefox
    swayidle
    swaylock
    udiskie
    stremio
    hyprpaper
    parsec-bin
    pavucontrol
    killall
    wineWowPackages.waylandFull
    bottles
    nnn
    thonny
    steam
    libvirt
    steam-run
    git
    obsidian
    discord
    cozette
    spleen
    pipewire
    wireplumber
    sublime
    webcord-vencord
    inconsolata
    qflipper
    cliphist
    pamixer
    kitty
    tofi
    qt5.qtwayland
    rustup
    libvirt
    virt-manager-qt
    qt6.qtwayland
    webkitgtk
    eww-wayland
      
  ] ++ [
    orca.packages.${system}.default
  ]);

  fonts = {
    fontconfig = {
      enable = lib.mkForce true;
    };
  };
  
  home.file = {
    # # Building this configuration will create a copy of 'dotfiles/screenrc' in
    # # the Nix store. Activating the configuration will then make '~/.screenrc' a
    # # symlink to the Nix store copy.
    # ".screenrc".source = dotfiles/screenrc;

    # # You can also set the file content immediately.
    # ".gradle/gradle.properties".text = ''
    #   org.gradle.console=verbose
    #   org.gradle.daemon.idletimeout=3600000
    # '';
  };

  home.sessionVariables = {
    EDITOR = "hx";
  };

  programs = {
    home-manager.enable = true;
    zsh = {
      enable = true;
      enableCompletion = true;
      enableAutosuggestions = true;
      history = {
        expireDuplicatesFirst = true;
      };
    };
  };
  xdg.enable = true;

  services = {
    syncthing.enable = true;
    swayidle = {
      enable = true;
      systemdTarget = "hyprland=session.target";
      timeouts = [
        {
          timeout = 300;
          command = "${pkgs.swaylock}/bin/swaylock -fFu -c 1a1b26f2";
        }
        {
          timeout = 600;
          command = "${pkgs.hyprland}/bin/hyprctl dispatch dpms off";
          resumeCommand = "${pkgs.hyprland}/bin/hyprctl dispatch dpms on";
        }
      ];
      events = [
        {
          event = "before-sleep";
          command = "${pkgs.swaylock}/bin/swaylock -fFu -c 1a1b26f2";
        }
        {
          event = "lock";
          command = "${pkgs.swaylock}/bin/swaylock -fFu -c 1a1b26f2";
        }
      ];
    };
  };

  
}