brew tap problem

[PlumpMath]

Error: No available tap homebrew/cask. Run brew tap --force homebrew/cask to tap homebrew/cask!

What's the problem with this happening every time?

  enable = true;
  onActivation = {
    autoUpdate = true;
    upgrade = true;
    cleanup = "zap";
  };
  global.brewfile = true;

[johnhampton]

It might be related to this: https://github.com/Homebrew/brew/issues/16761

[fabstu]

Had to comment out homebrew/cask under taps:

homebrew.taps = [
    # "homebrew/cask"
    "homebrew/cask-versions"
];