rails-1.2.3 to 2.1.1 give memcache-client error

my old project is in rails-1.2.3 i installed rails-2.1.1.gem i changed RAILS_GEM_VERSION='2.1.1' in environment.rb i started script/server webrick everything is fine

when i checked in browser http://localhost:3000 500 Internal Server Error here is my log file(log/development.log)

DEPRECATION WARNING: config.action_view.cache_template_extensions option has been deprecated and has no affect. Please remove it from your config files. See http://www.rubyonrails.org/deprecation for details. (called from send at D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/initializer.rb:464) DEPRECATION WARNING: The fragment_cache_store= method is now use cache_store= See http://www.rubyonrails.org/deprecation for details. (called from fragment_cache_store= at D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/caching/fragments.rb:33) DEPRECATION WARNING: Inflector is deprecated! Use ActiveSupport::Inflector instead. See http://www.rubyonrails.org/deprecation for details. (called from D:/Projects/yfly_fresh/config/environment.rb:16) /!\ FAILSAFE /!\ Fri Oct 03 12:33:05 +0530 2008   Status: 500 Internal Server Error   No connection to server     D:/pacs/ruby/lib/ruby/gems/1.8/gems/memcache-client-1.5.0/lib/memcache.rb:625:in `request_setup'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/memcache-client-1.5.0/lib/memcache.rb:204:in `get'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/session/mem_cache_store.rb:61:in `initialize'     D:/pacs/ruby/lib/ruby/1.8/cgi/session.rb:273:in `new'     D:/pacs/ruby/lib/ruby/1.8/cgi/session.rb:273:in `initialize_without_cgi_reader'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/cgi_ext/session.rb:39:in `initialize'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/cgi_process.rb:132:in `new'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/cgi_process.rb:132:in `session'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/cgi_process.rb:168:in `stale_session_check!'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/cgi_process.rb:116:in `session'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/base.rb:1139:in `assign_shortcuts_without_flash'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/flash.rb:166:in `assign_shortcuts'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/base.rb:523:in `process_without_filters'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/filters.rb:568:in `process_without_session_management_support'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/session_management.rb:130:in `process'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/base.rb:389:in `process'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:149:in `handle_request'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:107:in `dispatch'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:104:in `synchronize'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:104:in `dispatch'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:35:in `dispatch'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/webrick_server.rb:112:in `handle_dispatch'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/webrick_server.rb:78:in `service'     D:/pacs/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'     D:/pacs/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'     D:/pacs/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/webrick_server.rb:62:in `dispatch'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/commands/servers/webrick.rb:66     D:/pacs/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'     D:/pacs/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `require'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:355:in `new_constants_in'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `require'     D:/pacs/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/commands/server.rb:39     D:/pacs/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'     D:/pacs/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'     ./script/server:4     -e:2:in `load'     -e:2

is memcahe-client compatible with rails-2.1.1 ? any help ?

  Status: 500 Internal Server Error   No connection to server

I had the same error, but I shamefully found out my memcached daemon wasn't running. A

  # memcached -u www-data

solved it all.

Hope this helps, Michael