heroku_herocutter - 未定义的方法“列表”；对于类 `Heroku::Command::Plugins

Question

我正在尝试安装 Heroku Herocutter

运行时：

$ heroku plugins:install git://github.com/hone/heroku_herocutter.git
ERROR: Unable to load plugin heroku_herocutter: undefined method `list' for class `Heroku::Command::Plugins'

/Users/xxxx/.heroku/plugins/heroku_herocutter/lib/heroku_herocutter.rb:26:in `install': undefined method `fetch_git_uri' for #<Heroku::Command::Plugins:0x1020eed10 @options={}, @args=[]> (NoMethodError)
    from /Library/Ruby/Gems/1.8/gems/heroku-2.1.4/lib/heroku/command.rb:117:in `send'
    from /Library/Ruby/Gems/1.8/gems/heroku-2.1.4/lib/heroku/command.rb:117:in `run'
    from /Library/Ruby/Gems/1.8/gems/heroku-2.1.4/bin/heroku:14
    from /usr/bin/heroku:19:in `load'
    from /usr/bin/heroku:19

有建议吗？谢谢