error:
       … while calling the 'derivationStrict' builtin
         at «nix-internal»/derivation-internal.nix:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'home-manager-generation'
         whose name attribute is located at «git+https://github.com/mulatta/nixpkgs?ref=main&rev=fc72407154499465a0a17863df85ea0d3063e4b1&shallow=1»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'buildCommand' of derivation 'home-manager-generation'
         at «git+https://github.com/mulatta/nixpkgs?ref=main&rev=fc72407154499465a0a17863df85ea0d3063e4b1&shallow=1»/pkgs/build-support/trivial-builders/default.nix:81:17:
           80|         enableParallelBuilding = true;
           81|         inherit buildCommand name;
             |                 ^
           82|         passAsFile = [ "buildCommand" ] ++ (derivationArgs.passAsFile or [ ]);

       … while evaluating the option `home.activation.checkFilesChanged.data':

       … while evaluating definitions from `/nix/store/8rnci6rr28qyzk03zwd90jf0zrm233gd-source/modules/files.nix':

       … while evaluating the option `home.file."Library/Fonts/.home-manager-fonts-version".onChange':

       … while evaluating definitions from `/nix/store/8rnci6rr28qyzk03zwd90jf0zrm233gd-source/modules/targets/darwin/fonts.nix':

       … while evaluating the option `home.packages':

       … while evaluating definitions from `/nix/store/7yc2qg3ijwpc2g5gdswwnq9419h3vn47-source/home-manager/modules/mail':

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

       error: undefined variable 'email-sync'
       at /var/lib/nixbot/worktrees/59-cbc2143191be-33a7b84f/home-manager/modules/mail/default.nix:26:9:
           25|         inputs.skillz.packages.${pkgs.stdenv.hostPlatform.system}.crabfit-cli
           26|         email-sync
             |         ^
           27|         gnupg