我使用的是Ubuntu 14.04，我是一个使用Ruby on Rails的初学者
我最近安装了rbenv，ruby 2.3.0和rails 4.2.4，教程如下： https ：//gorails.com/setup/ubuntu/14.04
安装之后，我运行了ruby -v和rails -v，并获得了预期的版本。 到现在为止还挺好。 然后，我跑了rails s ，我得到了：
rails server bin/rails:6: warning: already initialized constant APP_PATH error
为了解决这个问题，我运行： rake rails:update:bin下面的这个StackOverflow问题： rails server bin / rails：6：warning：已经初始化常量APP_PATH错误导致了一个新的错误（我也删除了Spring gem）：
Gem::LoadError: You have already activated rake 10.4.2, but your Gemfile requires rake 10.5.0. Prepending `bundle exec` to your command may solve this. /my-home-directory/my-ruby-on-rails-project/config/boot.rb:3:in `<top (required)>' /my-home-directory/my-ruby-on-rails-project/config/application.rb:1:in `<top (required)>' /my-home-directory/my-ruby-on-rails-project/Rakefile:4:in `<top (required)>' LoadError: cannot load such file -- bundler/setup /my-home-directory/my-ruby-on-rails-project/config/boot.rb:3:in `<top (required)>' /my-home-directory/my-ruby-on-rails-project/config/application.rb:1:in `<top (required)>' /my-home-directory/my-ruby-on-rails-project/Rakefile:4:in `<top (required)>' (See full trace by running task with --trace)
我预先安装了“bundle exec”，出现以下错误：
/my-home-directory/my-ruby-on-rails-project/.bundle/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:29:in `require': libruby.so.2.2: cannot open shared object file: No such file or directory - /my-home-directory/my-ruby-on-rails-project/.bundle/gems/nokogiri-1.6.7.2/lib/nokogiri/nokogiri.so (LoadError) from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:29:in `rescue in <top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:25:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/fog-1.23.0/lib/fog/xml.rb:1:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/fog-1.23.0/lib/fog/xml.rb:1:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/fog-1.23.0/lib/fog.rb:11:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/fog-1.23.0/lib/fog.rb:11:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave/storage/fog.rb:3:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave/storage/fog.rb:3:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave/storage.rb:9:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave/storage.rb:9:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave.rb:78:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/carrierwave-0.10.0/lib/carrierwave.rb:78:in `<top (required)>' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in `require' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in `block (2 levels) in require' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require' from /my-home-directory/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.11.2/lib/bundler.rb:99:in `require' from /my-home-directory/my-ruby-on-rails-project/config/application.rb:7:in `<top (required)>' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:78:in `require' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:78:in `block in server' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in `tap' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in `server' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in `run_command!' from /my-home-directory/my-ruby-on-rails-project/.bundle/gems/railties-4.2.4/lib/rails/commands.rb:17:in `<top (required)>' from bin/rails:8:in `require' from bin/rails:8:in `<main>'
在安装rbenv之前，我使用了RVM，并且出现了相同的错误。 当我开始遇到这些问题时，我无法弄清楚我做了什么改变。
为了我的理智，任何帮助非常感谢！
谢谢你们！
我的一个朋友帮我解决了这个问题。 他建议：
奇迹般有效。 我问他为什么认为我有这些问题，并说：很难说，一个乱七八糟的.bundle目录可以做很多时髦的东西。