Foreman:命令"start"未定义

Jac*_*ham 3 ruby-on-rails foreman

我试图从命令行运行时遇到上述错误foreman start.

我安装了宝石:

gem install foreman
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然后定义了一个procfile.为什么我收到此错误?当我运行工头列表时,我得到:

Available commands:
  build         Commission Forman to build a new Laravel app for you
  help          Displays help for a command
  list          Lists commands
  scaffold      Generate a scaffolded Foreman template file
  self-update   Updates the application.
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