building Nix...
building the system configuration...
error:
       … while calling the 'head' builtin

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:1575:11:

         1574|         || pred here (elemAt values 1) (head values) then
         1575|           head values
             |           ^
         1576|         else

       … while evaluating the attribute 'value'

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:809:9:

          808|     in warnDeprecation opt //
          809|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          810|         inherit (res.defsFinal') highestPrio;

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

       error: A definition for option `home-manager.users.deadvey.home.stateVersion' is not of type `one of "18.09", "19.03", "19.09", "20.03", "20.09", "21.03", "21.05", "21.11", "22.05", "22.11", "23.05", "23.11", "24.05"'. Definition values:
       - In `/etc/nixos/configuration.nix': "unstable"