error:
       … while evaluating the attribute 'optionalValue.value'
         at «git+https://github.com/NixOS/nixpkgs?ref=nixpkgs-unstable&rev=3d8f0f3f72a6cd4d93d0ad13203f2ea1cb7e1456&shallow=1»/lib/modules.nix:1330:5:
         1329|
         1330|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1331|   };

       … while evaluating a branch condition
         at «git+https://github.com/NixOS/nixpkgs?ref=nixpkgs-unstable&rev=3d8f0f3f72a6cd4d93d0ad13203f2ea1cb7e1456&shallow=1»/lib/modules.nix:1330:21:
         1329|
         1330|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1331|   };

       … while evaluating definitions from `/nix/store/xfg4bws749i95jvnxhymxmfwailzk38q-source/modules/transposition.nix':

       … while evaluating definitions from `/nix/store/pwzv0gvph47cya8jdjhp3vnh0dsxq2mh-source/checks/flake-module.nix, via option perSystem':

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/yijgvcly3sdvj90y55w6qd7lcihzy36s-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/yijgvcly3sdvj90y55w6qd7lcihzy36s-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.zerotierone.serviceConfig':

       … while evaluating definitions from `/nix/store/yijgvcly3sdvj90y55w6qd7lcihzy36s-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.zerotierone.preStart':

       … while evaluating definitions from `/nix/store/yijgvcly3sdvj90y55w6qd7lcihzy36s-source/nixos/modules/services/networking/zerotierone.nix':

       … while evaluating the option `services.zerotierone.joinNetworks':

       … while evaluating definitions from `/nix/store/amd6azqbxnz6j41892kjx8b6y9hz3pmb-source/clanServices/zerotier/default.nix, via option flake.clan._services.allServices.clan-core-zerotier.perMachine, via option nixosModule':

       … while evaluating the option `clan.core.vars.generators.zerotier-network-zerotier-claninfra.files.network-id.value':

       … while evaluating the option `clan.core.vars.generators.zerotier-network-zerotier-claninfra.files.network-id.path':

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

       error: File 'network-id' of generator 'zerotier-network-zerotier-claninfra' does not exist. Try running 'clan vars generate' first.