$ brew cask list Error: Cask 'alfred' definition is invalid: Bad header line: parse failed どうやら2015/12/10時点でhomebrew-caskが本家に移行したらしいです。 https://github.com/caskroom/homebrew-cask/pull/15381 https://github.com/Homebrew/homebrew/pull/46795 というわけでhomebrew-caskは削除してねってことみたいなので以下のCommandを実行します。
![homebrew-caskがErrorになると思ったら本家に移行してた - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/a6a67738dfb5c77feea2f5fcaf5524816b615e77/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9aG9tZWJyZXctY2FzayVFMyU4MSU4Q0Vycm9yJUUzJTgxJUFCJUUzJTgxJUFBJUUzJTgyJThCJUUzJTgxJUE4JUU2JTgwJTlEJUUzJTgxJUEzJUUzJTgxJTlGJUUzJTgyJTg5JUU2JTlDJUFDJUU1JUFFJUI2JUUzJTgxJUFCJUU3JUE3JUJCJUU4JUExJThDJUUzJTgxJTk3JUUzJTgxJUE2JUUzJTgxJTlGJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmdHh0LWNsaXA9ZWxsaXBzaXMmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1hODY2Mzg4N2YyYjYxNWYzMWFkNDM2ZGRjODU3NzhlYg%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwZW1vbnVoJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1jYWJjZTUxYTViMGQ0YjE5ZWJkYzE2YWRiMTIwNGYwMA%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D745570852a26fbb0eb4023158566c2d0)