Issue on the nix-develop guide 3

[Joshua]

Hi,

I'm not sure if I'm missing something from the previous guides. When I run the first line in the guide this is my result.

joshua@nixos ~> nix --version
nix (Nix) 2.13.6
joshua@nixos ~> nix develop "github:DeterminateSystems/zero-to-nix#example" --show-trace
error:
       … while updating the lock file of flake 'github:DeterminateSystems/zero-to-nix/1f79c82aa98f62134bd8d505cbdfbfe013afeedc'

       error: cannot write modified lock file of flake 'github:DeterminateSystems/zero-to-nix' (use '--no-write-lock-file' to ignore)

Am I missing something obvious?

[Luc Perkins]

You'll need to upgrade Nix, as 2.13.* is pretty dated at this point: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-upgrade-nix