rails thin 서버 사용 오류

rails 를 사용 하여 thin 서버 를 시작 하 는 중 오류 가 발생 했 습 니 다.
다음 과 같다.
/Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `require': no such file to load -- thin (LoadError)
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler/thin.rb:1
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `const_get'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/server.rb:269:in `inject'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `each'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `inject'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'
from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/server.rb:269:in `server'
from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands/server.rb:59:in `start'
from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:55
from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap'
from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:50
from ./script/rails:6:in `require'
from ./script/rails:6
 
해결 방법:
rails 에서 만 든 파일 Gemfile 에 다음 과 같이 추가 합 니 다.
gem 'thin'
저장 후 다시 시작:

./script/rails s thin
=> Booting Thin
=> Rails 3.2.8 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
>> Thin web server (v1.5.0 codename Knife)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop