Simple_Form --Bootstrap rails - 找不到生成器

Question

我正在运行rails 4.2.0和ruby 2.2.1p85我在尝试生成simple_form时仍然遇到以下错误。任何想法？

justin@justin-ThinkPad-T60:~/workspaces/gigitt$ rails g simple_form:install --bootstrap
Could not find generator 'simple_form:install'. Maybe you meant 'responders:install' or 'devise:install' or 'integration_test'
Run `rails generate --help` for more options.
justin@justin-ThinkPad-T60:~/workspaces/gigitt$

以下是我的副本：

Gemfile：http://pastebin.com/csVtdW1m Gemfile.lock：http://pastebin.com/csi20pqP