Enabling plasma-manager gives error: attribute 'xor' missing

[Ilwyd]

I'm new to NixOS and I'm attempting to start using plasma-manager, however when I run home-manager switch --flake . I get the following error: error: attribute 'xor' missing at /nix/store/2yv61xbgv9f94akkmz11wpny8vbmhqmm-source/modules/workspace.nix:377:23

This is my flake.nix file:

{

    description = "My first flake!";

    inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
        home-manager.url = "github:nix-community/home-manager/master";
        home-manager.inputs.nixpkgs.follows = "nixpkgs"; # Make sure that the nixpkgs and home-manager versions are the same
        nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=v0.4.1"; # unstable branch. Use github:gmodena/nix-flatpak/?ref=<tag> to pin releases.
        plasma-manager = {
            url = "github:nix-community/plasma-manager";
            inputs.nixpkgs.follows = "nixpkgs";
            inputs.home-manager.follows = "home-manager";
        };
    };

    outputs = inputs@ {self, nixpkgs, home-manager, nix-flatpak, plasma-manager, ... }:
        let
            lib = nixpkgs.lib;
            system = "x86_64-linux";
            pkgs = nixpkgs.legacyPackages.${system};
        in {
            nixosConfigurations = {
                nixos = lib.nixosSystem {
                    inherit system;
                    modules = [ 
                        nix-flatpak.nixosModules.nix-flatpak
                        ./configuration.nix 
                    ];
                };
            };

            homeConfigurations = {
                myUser = home-manager.lib.homeManagerConfiguration {
                    inherit pkgs;
                    modules = [ 
                        inputs.plasma-manager.homeManagerModules.plasma-manager
                        ./home.nix 
                        ./user/user.nix
                    ];
                    extraSpecialArgs = {
                        inherit plasma-manager;
                    };
                };
            };
        };
}

./user/user.nix just imports another .nix file which has the output of rc2nix. Even with all of the configuration removed and just programs.plasma.enabled = true; I still get the same error ./home.nix has username and homeDirectory set up as shown here

Not sure what I'm doing wrong here, but it may be something obvious to others. Any help is appricated.

[HeitorAugustoLN]

Well, this looks like it is missing lib.xor. Not really sure why it is happening, since apparently it is still available in latest nixos-unstable

[HeitorAugustoLN]

Could you check for it in nix repl if it exists like this:

nixpkgs = import <nixpkgs> {}
nixpkgs.lib.xor

[Ilwyd]

It looks like I've gotten it sorted out, although I'm not exactly certain what I did to fix it. I ran nix flake update last night and did a restart which I think might be the solution.