请问各位，我用 carrierwave 上传头像，在的 development 模式下可以正常使用，切到 production 后上传图片就取不到了，图片有正常上传，这个大概是什么问题引起。

ActionController::RoutingError (No route matches [GET] "/uploads/user/avatar/52b26abf6478775812000000/big_avatar/52b26abf6478775812000000.jpg"): actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:21:in call' actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:incall' railties (4.0.0) lib/rails/rack/logger.rb:38:in call_app' railties (4.0.0) lib/rails/rack/logger.rb:21:inblock in call' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in block in tagged' activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:intagged' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in tagged' railties (4.0.0) lib/rails/rack/logger.rb:21:incall' actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:in call' rack (1.5.2) lib/rack/methodoverride.rb:21:incall' rack (1.5.2) lib/rack/runtime.rb:17:in call' activesupport (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:incall' railties (4.0.0) lib/rails/engine.rb:511:in call' railties (4.0.0) lib/rails/application.rb:97:incall' rack (1.5.2) lib/rack/lock.rb:17:in call' rack (1.5.2) lib/rack/content_length.rb:14:incall' rack (1.5.2) lib/rack/handler/webrick.rb:60:in service' /home/dxw/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:inservice' /home/dxw/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in run' /home/dxw/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:inblock in start_thread'