Nix unfree packages not working

[OwenLee11]

I am trying to make a vscode tunnel with replit however, I get this error:

nix error: building nix env: exit status 1
Output has been trimmed to the last 20 lines
 Note: For `nix shell`, `nix build`, `nix develop` or any other Nix 2.4+
 (Flake) command, `--impure` must be passed in order to read this
 environment variable.
    
b) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.

Alternatively you can configure a predicate to allow specific packages:
  { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
      "vscode"
    ];
  }

c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnfree = true; }
to ~/.config/nixpkgs/config.nix.

(use '--show-trace' to show detailed location information)

sh: 1: cowsay: not found
exit status 127
nix error: building nix env: exit status 1
Output has been trimmed to the last 20 lines
 Note: For `nix shell`, `nix build`, `nix develop` or any other Nix 2.4+
 (Flake) command, `--impure` must be passed in order to read this
 environment variable.
    
b) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.

Alternatively you can configure a predicate to allow specific packages:
  { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
      "vscode"
    ];
  }

c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnfree = true; }
to ~/.config/nixpkgs/config.nix.

(use '--show-trace' to show detailed location information)```

But when I make .config/nixpkgs/config.nix and but allowUnfree = true; in it, it does not work and gives an infinite "loading nix environment". What should I do?
Repl: https://replit.com/@OwenLee11/vscode-testing

[anon40284853]

``` code language (e.g., "python") or "text"
Please format your code and output like this.
```

[804kn]

Here’s the following on how to enable unfree

create the folder .config in your base dir (If you can’t create or it’s not visible, enable hidden files by pressing the 3 dots and pressing show hidden files)

Navigate to .config and create a folder named nixpkgs
Once there, create a file named config.nix (Path should be .config/nixpkgs/config.nix
Once there, insert:

{
    allowUnfree = true;
}

In the nix file, then goto your shell and type echo, it will reload and you will then have unfree enabled

[OwenLee11]

When I do that, it just makes the repl go into an infinite loading loop. It says Loading nix environment.

[804kn]

It’s probably due to the package, as when you have allowUnfree = true;, it will then load the package, with it being off it will be disabled, could you please link the repl so I can see the configuration?

[OwenLee11]

I was using vscode, it was not working but I found a different way to do what I wanted. Thank you for your help.