Purescript / Halogen project initialization flag not working

[XDead27]

Hello, when running the installation steps described in https://ihp.digitallyinduced.com/Guide/purescript.html, specifically the command

ihp-new --purescript-halogen my-ihp-purescript-halogen-project

I get an error,

path '.../my-ihp-purescript-halogen-project' does not contain a 'flake.nix', searching up
error: path '.../my-ihp-purescript-halogen-project' is not part of a flake (neither it nor its parent directories contain a 'flake.nix' file)

It seems like the folder gets created without the flake.nix file. There is no more information i get from running the command. I use ihp-new version 1.3.0 on NixOS.

Is there any way to get this template to work without the flag? I am trying to look into what the flag was supposed to do. Thanks!