error: while calling the 'derivationStrict' builtin at /builtin/derivation.nix:9:12: (source not available)

[thenicnet]

OS Version: 24.10
OS Distro: Ubuntu

I run the install commands and everything looks like it's working until this:

Configured https://simula.cachix.org binary cache in /home/user/.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/user/Documents/VR/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/user/Documents/VR/Simula' is a shallow Git repository, but shallow repositories are only allowed when `shallow = true;` is specified.

Please let me know what info to provide and I'll see what I can do. It's probably something silly that I missed.

Thanks and Happy Holidays.