tried fixing config

flake.nix

@@ -96,6 +96,12 @@
             inherit specialArgs;
           };
           modules = [
+            (
+              { ... }:
+              {
+                nix.registry.nixpkgs.flake = nixpkgs;
+              }
+            )
             ./hosts/dionysos/configuration.nix
           ];
           format = "proxmox";

hosts/dionysos/configuration.nix

@@ -1,9 +1,11 @@
 {
   config,
   pkgs,
-  username,
   ...
 }:
+let
+  username = "harry123";
+in
 {
   environment.systemPackages = with pkgs; [
     weechat