Failed build switch with river-bsp-layout flake

flake.lock

@@ -36,10 +36,28 @@
         "type": "github"
       }
     },
+    "river-bsp-layout": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1,
+        "narHash": "sha256-b2XIcJcOdlaEaakgN/VSXCk5JD2mtxNDt+zJINuvGA0=",
+        "path": "./packages/river-bsp-layout",
+        "type": "path"
+      },
+      "original": {
+        "path": "./packages/river-bsp-layout",
+        "type": "path"
+      }
+    },
     "root": {
       "inputs": {
         "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "river-bsp-layout": "river-bsp-layout"
       }
     }
   },

rebuild.log

@@ -0,0 +1,42 @@
+

Using saved setting for 'experimental-features = nix-command flakes' from ~/.local/share/nix/trusted-settings.json.
+warning: updating lock file '/home/ii/Public/git/nix/confix/flake.lock':
+• Added input 'river-bsp-layout':
+    'path:./packages/river-bsp-layout?lastModified=1&narHash=sha256-b2XIcJcOdlaEaakgN/VSXCk5JD2mtxNDt%2BzJINuvGA0%3D' (1970-01-01)
+• Added input 'river-bsp-layout/nixpkgs':
+    follows 'nixpkgs'
+warning: Git tree '/home/ii/Public/git/nix/confix' is dirty
+building the system configuration...
+warning: Git tree '/home/ii/Public/git/nix/confix' is dirty
+Using saved setting for 'experimental-features = nix-command flakes' from ~/.local/share/nix/trusted-settings.json.
+trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
+trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
+trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
+error:
+       … while calling the 'head' builtin
+
+         at /nix/store/50bgi74d890mpkp90w1jwc5g0dw4dccr-source/lib/attrsets.nix:960:11:
+
+          959|         || pred here (elemAt values 1) (head values) then
+          960|           head values
+             |           ^
+          961|         else
+
+       … while evaluating the attribute 'value'
+
+         at /nix/store/50bgi74d890mpkp90w1jwc5g0dw4dccr-source/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: attribute 'default' missing
+
+       at /nix/store/kxin55alcm5ka8qyw9drkj6xwlzp08f7-source/nixos/wayland.nix:51:7:
+
+           50|   environment.systemPackages = [
+           51|       inputs.river-bsp-layout.default
+             |       ^
+           52|   ];