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.vlans':

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

       … while evaluating the option `containers.peer1.networking.interfaces':

       … while evaluating definitions from `/nix/store/4b8fr08m7yklfr8vmfsjsclvv2aa0764-source/nixos/modules/hardware/facter/networking':

       … while evaluating the option `containers.peer1.hardware.facter.enable':

       … while evaluating the option `containers.peer1.hardware.facter.report':

       … while evaluating the option `containers.peer1.hardware.facter.reportPath':

       … while evaluating definitions from `/nix/store/bdgda00miwpfryv6z30vdgrw0szvviya-source/nixosModules/clanCore/nixos-facter.nix':

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

       error: gRPC FetchNars failed: error: path '/nix/store/ndg38p68611qx8677j5n5zav5n4f0czb-merged-test-dir-hello-service' is required, but there is no substituter that can build it