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Rubyを1.9.3から2.0.0にアップグレードした後、新しいRailsプロジェクトを作成しました。プロジェクトを作成した後、私はrails serverを実行しようが、私は次のエラーを取得する：Railsサーバーの起動時にエラーが発生しました
[email protected]:~/sr# rails s
/home/giri/.rvm/gems/ruby-2.0.0-p576/gems/actionpack-4.1.6/lib/action_controller/metal/strong_parameters.rb:106: warning: already initialized constant ActionController::Parameters::NEVER_UNPERMITTED_PARAMS
/home/giri/.rvm/gems/ruby-2.0.0-p576/gems/actionpack-4.1.6/lib/action_controller/metal/strong_parameters.rb:106: warning: previous definition of NEVER_UNPERMITTED_PARAMS was here
/home/giri/.rvm/gems/ruby-2.0.0-p576/gems/actionpack-4.1.6/lib/action_controller/metal/strong_parameters.rb:106: warning: already initialized constant ActionController::Parameters::NEVER_UNPERMITTED_PARAMS
/home/giri/.rvm/gems/ruby-2.0.0-p576/gems/actionpack-4.1.6/lib/action_controller/metal/strong_parameters.rb:106: warning: previous definition of NEVER_UNPERMITTED_PARAMS was here
/home/giri/.rvm/gems/ruby-2.0.0-p576/gems/coffee-rails-4.0.1/lib/coffee-rails.rb:1:in `require': cannot load such file -- coffee-script (LoadError)
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/coffee-rails-4.0.1/lib/coffee-rails.rb:1:in `<top (required)>'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:88:in `require'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:88:in `block (2 levels) in require'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:83:in `each'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:83:in `block in require'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:72:in `each'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler/runtime.rb:72:in `require'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/bundler-1.12.0.rc/lib/bundler.rb:102:in `require'
from /home/giri/sr/config/application.rb:7:in `<top (required)>'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:79:in `require'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:79:in `block in server'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:76:in `tap'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:76:in `server'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/giri/.rvm/gems/ruby-2.0.0-p576/gems/railties-4.1.6/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'