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我正在部署我的Rails 3.2.2，Ruby 1.9.3應用程序與Capistrano到Linux服務器。當我運行一個cap deploy我得到這個錯誤：Capistrano部署，資產管道，ruby調試沒有找到
* executing `deploy:assets:precompile'
* executing "cd /var/www/production/releases/20120418090209 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile"
servers: ["example.com"]
[example.com] executing command
[example.com] sh -c 'cd /var/www/production/releases/20120418090209 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile'
** [out :: example.com] rake aborted!
** [out :: example.com] cannot load such file -- ruby-debug
** [out :: example.com]
** [out :: example.com] (See full trace by running task with --trace)
command finished in 8962ms
*** [deploy:update_code] rolling back
* executing "rm -rf /var/www/production/releases/20120418090209; true"
servers: ["example.com"]
[example.com] executing command
[example.com] sh -c 'rm -rf /var/www/production/releases/20120418090209; true'
command finished in 176ms
failed: "sh -c 'cd /var/www/production/releases/20120418090209 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile'" on example.com
它說，該ruby-debug寶石沒有被發現。但是Ruby調試是不是製作組在我的Gemfile裏：
group :development, :test do
gem "steak"
gem "linecache19", :git => "git://github.com/mark-moseley/linecache", :require => "ruby-debug"
gem "ruby-debug-base19x", "~> 0.11.30.pre4"
gem "ruby-debug19"
gem "rails_best_practices"
gem "ruby_parser"
gem "reek"
gem "flog"
gem "jslint_on_rails", :git => "git://github.com/psionides/jslint_on_rails"
gem "jasmine-rails"
end
導致錯誤獲取rake assets:precompile命令後拋出，我認爲它有一些待辦事項與Capistrano的和load 'deploy/assets'叫我Capfile內：
load 'deploy' if respond_to?(:namespace) # cap2 differentiator
Dir['config/deploy/recipes/*.rb','vendor/gems/*/recipes/*.rb','vendor/plugins/*/recipes/*.rb'].each { |plugin| load(plugin) }
load 'config/deploy' # remove this line to skip loading any of the default tasks
# Uncomment if you are using Rails' asset pipeline
load 'deploy/assets'
當我刪除這條線時，一切正常部署，但（當然）資產沒有在生產中找到。而且，如果我直接在服務器上運行bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile（在應用程序目錄中），我會得到相同的錯誤。
那我該怎麼辦？