Cant install proxmox on NixOS

[CUexter]

> Building NixOS configuration
error:
       … while calling the 'head' builtin

         at /nix/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/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/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/lib/modules.nix:821:9:

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

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

       error: attribute 'stridtech' missing

       at /nix/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/pkgs/development/libraries/openssl/default.nix:236:54:

          235|       mainProgram = "openssl";
          236|       maintainers = with maintainers; [ thillux ] ++ lib.teams.stridtech.members;
             |                                                      ^
          237|       pkgConfigModules = [
┏━ 1 Errors: 
┃ error:
┃        … while calling the 'head' builtin
┃ 
┃          at /nix/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/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/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/lib/modules.nix:821:9:
┃ 
┃           820|     in warnDeprecation opt //
┃           821|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
┃              |         ^
┃           822|         inherit (res.defsFinal') highestPrio;
┃ 
┃        (stack trace truncated; use '--show-trace' to show the full trace)
┃ 
┃        error: attribute 'stridtech' missing
┃ 
┃        at /nix/store/7v6l2v247fmdgfpbs3w91mf6rinai4yk-source/pkgs/development/libraries/openssl/default.nix:236:54:
┃ 
┃           235|       mainProgram = "openssl";
┃           236|       maintainers = with maintainers; [ thillux ] ++ lib.teams.stridtech.members;
┃              |                                                      ^
┃           237|       pkgConfigModules = [
┣━━━                                                            
┗━ ∑ ⚠ Exited with 1 errors reported by nix at 19:00:43 after 0s
Error: 
   0: Command exited with status Exited(1)

Location:
   src/commands.rs:151

probably a outdated package error