error:
       … while evaluating a branch condition
         at «string»:25:5:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |     ^
           26|       v

       … in the left operand of the OR (||) operator
         at «string»:25:28:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |                            ^
           26|       v

       … while evaluating definitions from `/nix/store/48zqzq821m7c3faj5prg2l8pami0dbxj-source/systems/live-image.nix':

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

       error: Module `/nix/store/48zqzq821m7c3faj5prg2l8pami0dbxj-source/modules/server.nix' has an unsupported attribute `services'. This is caused by introducing a top-level `config' or `options' attribute. Add configuration attributes immediately on the top level instead, or move all of them (namely: services) into the explicit `config' attribute.