error:
       … while evaluating the attribute 'drvPath'
         at «https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1093421.f20cd90e28fe/nixexprs.tar.xz?narHash=sha256-MTJCMrhDFb%2BGRbLxBPTp8kB4dDlO%2BegmQ5qsJgYuaWw%3D»/lib/customisation.nix:416:11:
          415|         // {
          416|           drvPath =
             |           ^
          417|             assert condition;

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

       … while evaluating the option `driverConfiguration.test_script':

       … while evaluating definitions from `/nix/store/4b8fr08m7yklfr8vmfsjsclvv2aa0764-source/nixos/lib/testing/driver-configuration.nix':

       … while evaluating the option `testScriptString':

       … while evaluating definitions from `/nix/store/4b8fr08m7yklfr8vmfsjsclvv2aa0764-source/nixos/lib/testing/testScript.nix':

       … while evaluating definitions from `/nix/store/bdgda00miwpfryv6z30vdgrw0szvviya-source/clanServices/zerotier/tests/vm-multi-instance/default.nix':

       … while evaluating the option `nodes.alpha.clan.core.vars.generators.zerotier-ip-alpha-net-a.files.ip.value':

       … while evaluating definitions from `/nix/store/bdgda00miwpfryv6z30vdgrw0szvviya-source/nixosModules/clanCore/vars/public/in_repo.nix, via option nodes.alpha.clan.core.vars.settings.fileModule':

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

       error: gRPC QueryValidPaths on 'nix-store.geninf.io:50051' failed: error: substituter 'https://cache-local.geninf.io' is disabled