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我将我的一个应用程序的 Rails 从 4.0.0 降级到 3.2.9。

宝石文件

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem "rails", "~> 3.2.9"

# OTHERS
gem 'will_paginate'

# Use postgresql as the database for Active Record
gem 'pg'

# Use SCSS for stylesheets
gem 'sass-rails',   '~> 3.2.3'

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.0.3'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 3.2.1'

问题是，每当我rails server现在运行时，它就好像应用程序不存在一样。

my@ubuntu:~/ruby/myapp$ rails s
Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]              # Path to the Ruby binary of your choice
...

为什么会这样，我该如何解决？

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