error:
       … while evaluating the attribute 'drvPath'
         at «https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1097569.e513db7b0a65/nixexprs.tar.xz?narHash=sha256-jWdazKTNUOJQ3KE%2B9BAvpBOo6THrD0Qyb3S8F2GduUI%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.containers.server.start_script':

       … while evaluating definitions from `/nix/store/zsrn88vjmb5hmshm6fimai52blbk3nlc-source/nixos/lib/testing/driver-configuration.nix':

       … while evaluating definitions from `/nix/store/zsrn88vjmb5hmshm6fimai52blbk3nlc-source/nixos/modules/virtualisation/nspawn-container':

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

       … while evaluating definitions from `/nix/store/zsrn88vjmb5hmshm6fimai52blbk3nlc-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `containers.server.programs.ssh.knownHosts.clan-sshd-self-ed25519.publicKey':

       … while evaluating definitions from `/nix/store/m6r41z6xm7kxdy9dii1zzqr1x7czg2ss-source/clanServices/sshd/default.nix, via option clan._services.allServices."self-@clan/sshd".roles.server.perInstance, via option nixosModule':

       … while evaluating the option `containers.server.clan.core.vars.generators.openssh.files."ssh.id_ed25519.pub".value':

       … while evaluating definitions from `/nix/store/m6r41z6xm7kxdy9dii1zzqr1x7czg2ss-source/nixosModules/clanCore/vars/public/in_repo.nix, via option containers.server.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