error:
       … while calling the 'deepSeq' builtin
         at /nix/store/bn0dhdip6kgph7ymw19zyihg04hmbl9l-source/lib/customisation.nix:487:35:
          486|     in
          487|     if drv == null then null else deepSeq drv' drv';
             |                                   ^
          488|

       … while evaluating the attribute 'outPath'
         at /nix/store/bn0dhdip6kgph7ymw19zyihg04hmbl9l-source/lib/customisation.nix:476:13:
          475|           value = commonAttrs // {
          476|             outPath = output.outPath;
             |             ^
          477|             drvPath = output.drvPath;

       … while evaluating the option `home.activation.checkFilesChanged.data':

       … while evaluating definitions from `/nix/store/63yk6ym7i5n1jyq992p4j4rnskgi256i-source/modules/files.nix':

       … while evaluating the option `home.file."Library/Fonts/.home-manager-fonts-version".onChange':

       … while evaluating definitions from `/nix/store/63yk6ym7i5n1jyq992p4j4rnskgi256i-source/modules/targets/darwin/fonts.nix':

       … while evaluating the option `home.sessionVariablesExtra':

       … while evaluating definitions from `/nix/store/xgsx4b0hx7brghlmg56616g1cgd9plal-source/home/mods/ssh-agent.nix':

       … while evaluating the option `services.nix-ssh-agent.ssh-askpass':

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

       error: A definition for option `services.nix-ssh-agent.ssh-askpass' is not of type `string'. Definition values:
       - In `/nix/store/xgsx4b0hx7brghlmg56616g1cgd9plal-source/home/mods/ssh-agent.nix': <derivation ssh-askpass>