Запуск тонкого сервера без тонкого камня не работает

Я использую ruby ​​1.9.3 и rails 3.2.2. Каждый раз, когда я использую тонкий сервер с драгоценным камнем private_pub, он не работает, я сделал стойку private_pub.ru -s thin -E production. Я получаю следующую ошибку

/home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `require': cannot load such file -- thin (LoadError)
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `<top (required)>'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `const_get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `block in get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `each'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `inject'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:269:in `server'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:265:in `start'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:137:in `start'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/bin/rackup:4:in `<top (required)>'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/bin/rackup:19:in `load'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/bin/rackup:19:in `<main>'
rzaartz@ubuntu:~/paper$ rvm 1.9.3
rzaartz@ubuntu:~/paper$ rackup private_pub.ru -s thin -E production
/home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `require': cannot load such file -- thin (LoadError)
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `<top (required)>'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `const_get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `block in get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `each'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `inject'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:269:in `server'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:265:in `start'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:137:in `start'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/bin/rackup:4:in `<top (required)>'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/bin/rackup:19:in `load'
    from /home/rzaartz/.rvm/gems/ruby-1.9.3-p125/bin/rackup:19:in `<main>'

, но если я включу тонкий драгоценный камень в свой файл драгоценного камня, он будет работать нормально. Любая помощь спасибо.