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

       … while evaluating derivation 'agent-vm'
         whose name attribute is located at «github:NixOS/nixpkgs/6774f7bc253789b113a4f39285dc0fa100abeacc?narHash=sha256-MYiI%2BCzL0tuWgRPjGsKCDHqYs2T3OzMlMQWOYWG0qso%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'text' of derivation 'agent-vm'
         at «github:NixOS/nixpkgs/6774f7bc253789b113a4f39285dc0fa100abeacc?narHash=sha256-MYiI%2BCzL0tuWgRPjGsKCDHqYs2T3OzMlMQWOYWG0qso%3D»/pkgs/build-support/trivial-builders/default.nix:135:11:
          134|           name
          135|           text
             |           ^
          136|           executable

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

       … while evaluating definitions from `/nix/store/zc9xvdvz642n6q20m04ixm30s98m6281-source/nixos/modules/system/activation/top-level.nix':

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

       error:
       Failed assertions:
       - The option definition `services.journald.extraConfig' in `/nix/store/9mwl1yc0dpsr6l29niaxlnllqfdasm82-source/modules/nixos/test-support' no longer has any effect; please remove it.
       Use services.journald.settings.Journal instead.