1error:2 … while evaluating a branch condition3 at «string»:25:5:4 24| v:5 25| if !builtins.isAttrs v || isDrv v then6 | ^7 26| v89 … in the left operand of the OR (||) operator10 at «string»:25:28:11 24| v:12 25| if !builtins.isAttrs v || isDrv v then13 | ^14 26| v1516 … while evaluating definitions from `/nix/store/lrxvs4l9bqbgjfz7w9bkfg5zqq442jxc-source/modules/transposition.nix':1718 … while evaluating definitions from `/nix/store/i5l34vj6sdwbr31jhzkpa2dqai7ww88d-source/flake.nix, via option perSystem':1920 … while evaluating the option `system.build.toplevel':2122 … while evaluating definitions from `/nix/store/q0fmv1i92s16082hq81qz7ynaxcbqmvz-source/nixos/modules/system/activation/top-level.nix':2324 … while evaluating the option `assertions':2526 … while evaluating definitions from `/nix/store/q0fmv1i92s16082hq81qz7ynaxcbqmvz-source/nixos/modules/system/boot/kernel.nix':2728 … while evaluating the option `boot.kernelPackages':2930 … while evaluating definitions from `/nix/store/24z7g2x5wxswn2a4dqbydqigxaf2n6hi-source/nixos/mixins/latest-zfs-kernel.nix':3132 … while evaluating the option `boot.zfs.package':3334 (stack trace truncated; use '--show-trace' to show the full, detailed trace)3536 error: The option `boot.zfs.package' is defined multiple times while it's expected to be unique.3738 Definition values:39 - In `/nix/store/i5l34vj6sdwbr31jhzkpa2dqai7ww88d-source/modules/amd_sev_snp.nix': <derivation zfs-user-2.4.99-unstable-2026-07-24>40 - In `/nix/store/i5l34vj6sdwbr31jhzkpa2dqai7ww88d-source/configurations.nix, via option flake.nixosModules.graham': <derivation zfs-user-2.4.99-unstable-2026-07-24>41 Use `lib.mkForce value` or `lib.mkDefault value` to change the priority on any of these definitions.