ruby - Rails deployment in production - always complain about dalli -

using can't rid of error when trying production deployment

could not find cache store adapter mem_cache_store (cannot load such file -- dalli) (runtimeerror) 

i don't understand. far i've had no problem deploying in development, , if change copy /environments/development.rb /environments/production.rb, still same message. have added gemdelli` in gemfile, still complains.

i don't know mem_cache_store comes from, because when explicitely change :memory_store :file_store, error remains same

environments/production.rb

rails.application.configure   config.cache_classes = true   config.eager_load = true   config.consider_all_requests_local       = false   config.action_controller.perform_caching = true   config.serve_static_files = false   config.assets.js_compressor = :uglifier   config.assets.css_compressor = :sass   config.assets.compile = false   config.assets.digest = true   config.assets.version = '1.0'   config.force_ssl = true   config.log_level = :debug   actionmailer::base.smtp_settings = {     :address => "localhost",   }   config.i18n.fallbacks = true   config.active_support.deprecation = :notify   config.cache_store = :memory_store   config.log_formatter = ::logger::formatter.new end 

capistrano deploy/production.rb

set :branch, :production set :stage, :production set :rails_env, 'production' set :deploy_to, '/var/www/******'  set :log_level, :debug set :keep_releases, 5 set :bundle_without, %w{test development}.join(' ')  set :bundle_flags, '--deployment --quiet' 

full stack trace of error

could not find cache store adapter mem_cache_store (cannot load such file -- dalli) (runtimeerror)   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/cache.rb:106:in `rescue in retrieve_store_class'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/cache.rb:104:in `retrieve_store_class'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/cache.rb:60:in `lookup_store'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application/bootstrap.rb:76:in `block in <module:bootstrap>'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'   /usr/local/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'   /usr/local/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'   /usr/local/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'   /usr/local/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'   /usr/local/lib/ruby/2.0.0/tsort.rb:180:in `each'   /usr/local/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'   /usr/local/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'   /var/www/intranet_rails_test/releases/20150511202754/config/environment.rb:7:in `<top (required)>'   config.ru:3:in `require'   config.ru:3:in `block in <main>'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/rack-1.6.0/lib/rack/builder.rb:55:in `instance_eval'   /var/www/intranet_rails_test/shared/bundle/ruby/2.0.0/gems/rack-1.6.0/lib/rack/builder.rb:55:in `initialize'   config.ru:1:in `new'   config.ru:1:in `<main>'   /usr/local/lib/ruby/gems/2.0.0/gems/passenger-4.0.37/helper-scripts/rack-preloader.rb:112:in `eval'   /usr/local/lib/ruby/gems/2.0.0/gems/passenger-4.0.37/helper-scripts/rack-preloader.rb:112:in `preload_app'   /usr/local/lib/ruby/gems/2.0.0/gems/passenger-4.0.37/helper-scripts/rack-preloader.rb:158:in `<module:app>'   /usr/local/lib/ruby/gems/2.0.0/gems/passenger-4.0.37/helper-scripts/rack-preloader.rb:29:in `<module:phusionpassenger>'   /usr/local/lib/ruby/gems/2.0.0/gems/passenger-4.0.37/helper-scripts/rack-preloader.rb:28:in `<main>' 

using capistrano 3, rails 4.2

some gems need packages installed. dalli uses memcached. if need dalli please use package manager install it(apt-get, etc)