Install error

Using Archlinux here. After a long time fetching repositories I get this error:

➜  Simula git:(master) ✗  LANG=en source ./utils/Helpers.sh && installSimula

/home/braulio/.nix-profile/bin/nix
nix already installed..
/nix/store/2cfgj2hqhjfyxmvqnbkviwc63nzkiw40-nix-forced-version
/home/braulio/.nix-profile/bin/cachix
cachix already installed..
/usr/bin/curl
curl already installed..
Configured https://simula.cachix.org binary cache in /home/braulio/.config/nix/nix.conf

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error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'Simula'
         whose name attribute is located at /nix/store/izxcyr1301yh0yi4g94ghfc72wrxn8sc-nixpkgs-24.05/pkgs/stdenv/generic/make-derivation.nix:331:7

       … while evaluating attribute 'src' of derivation 'Simula'

         at /home/braulio/Projects/Simula/Simula.nix:338:7:

          337|       name = "Simula";
          338|       src = if externalSrc != null then externalSrc else localSrc;
             |       ^
          339|       buildInputs = [ xpra xrdb wmctrl fontconfig glibc-locales xfce4-terminal-wrapped openxr-loader midori-wrapped pernoscoSubmit i3status-wrapped cabal-install ghc ] ++ simulaPackages;

       error: '/home/braulio/Projects/Simula' is a shallow Git repository, but shallow repositories are only allowed when `shallow = true;` is specified.
~/Projects/Simula

Start with utils/Helpers.sh and the installSimula entry point, then inspect Simula.nix around line 338 where src selects the local repository. Reproduce the installation on an Arch Linux checkout and investigate the shallow Git repository error; done means the reported installation proceeds past derivation evaluation.