Home-manager-generation.drv

error: builder for '/nix/store/fcva72g7qn1l42mfcm03gyqk8rpxf39y-home-manager-path.drv' failed with exit code 255;
       last 1 log lines:
       > error: collision between `/nix/store/yiprrhjphprclbfinf7k7s794r99vcw1-papirus-icon-theme-20240501/share/icons/Papirus-Dark/22x22@2x/apps/org.xfce.panel.directorymenu.svg' and `/nix/store/v1msvgbbacwnhnmdbl65la8ggjsc432z-papirus-icon-theme-20240501/share/icons/Papirus-Dark/22x22@2x/apps/org.xfce.panel.directorymenu.svg'
       For full logs, run 'nix log /nix/store/fcva72g7qn1l42mfcm03gyqk8rpxf39y-home-manager-path.drv'.
error: 1 dependencies of derivation '/nix/store/8z6zmqvbvz8g8gnbl2lamgqy8w0jgzv4-home-manager-generation.drv' failed to build

gtk

{ pkgs, ... }:
{
  fonts.fontconfig.enable = true;
  home.packages = with pkgs; [
    twemoji-color-font
    noto-fonts-emoji
    fantasque-sans-mono
  ];

  gtk = {
    enable = true;
    font = {
      name = "Maple Mono";
      size = 12;
    };
    theme = {
      name = "Colloid-Green-Dark-Gruvbox";
      package = pkgs.colloid-gtk-theme.override {
        colorVariants = [ "dark" ];
        themeVariants = [ "green" ];
        tweaks = [
          "gruvbox"
          "rimless"
          "float"
        ];
      };
    };
    iconTheme = {
      name = "Papirus-Dark";
      package = pkgs.papirus-icon-theme.override { color = "black"; };
    };
    cursorTheme = {
      name = "Bibata-Modern-Ice";
      package = pkgs.bibata-cursors;
      size = 24;
    };
  };

  home.pointerCursor = {
    name = "Bibata-Modern-Ice";
    package = pkgs.bibata-cursors;
    size = 24;
  };
}

Looks as if you have 2 versions of the pairus icon theme in your home.packages

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