brew cask install firefox-ja ができなくなった問題の解決方法

解決方法

$ brew cask install firefox --language=ja

原因

• [https://github.com/caskroom/homebrew-versions/pull/2737](update firefox-beta to 50.0b5; add more languages.)
  • --language パラメータを新設したから firefox-ja が必要なくった模様。

それにしても

$ brew cask info firefox-ja
firefox-ja:
/usr/local/Caskroom/firefox-ja/49.0 (68B)
Error: Invalid tap name '/'Most likely, this means you have an outdated version of Homebrew-Cask. Please run:
  brew uninstall --force brew-cask; brew untap phinze/cask; brew untap caskroom/cask; brew update; brew cleanup; brew cask cleanup

If this doesn’t fix the problem, please report this bug:
  https://github.com/caskroom/homebrew-cask#reporting-bugs

/usr/local/Homebrew/Library/Homebrew/tap.rb:29:in `fetch'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli/info.rb:55:in `github_info'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli/info.rb:23:in `info'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli/info.rb:11:in `block in run'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli/info.rb:7:in `each'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli/info.rb:7:in `run'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:109:in `run_command'
/usr/local/Homebrew/Library/Homebrew/cask/lib/hbc/cli.rb:148:in `process'
/usr/local/Homebrew/Library/Homebrew/cask/cmd/brew-cask.rb:8:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Homebrew/Library/Homebrew/brew.rb:24:in `require?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:100:in `<main>'

brew cask info で該当する Cask がなくなった際のエラーメッセージがこれではわかりづらいよ…。