My application, a very simple general ledger, that worked very well until June 26 does not work any longer. It is used under Ubuntu 12.04 and I believe there was a Ruby update after that.
What happens? When I try to start the appIication I get the following output in my web browser: ActionDispatch::Session::SessionRestoreError Session contains objects whose class definition isn't available. Remember to require the classes for all objects kept in the session. (Original exception: uninitialized constant ActionController::Flash::FlashHash [NameError]) The environment is Rails 3.2.1 => Booting WEBrick => Rails 3.2.1 application starting in development on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server [2012-07-23 22:24:03] INFO WEBrick 1.3.1 [2012-07-23 22:24:03] INFO ruby 1.9.3 (2011-10-30) [i686-linux] and the console contains Started GET "/" for 127.0.0.1 at 2012-07-23 22:24:07 +0200 ActionDispatch::Session::SessionRestoreError (Session contains objects whose class definition isn't available. Remember to require the classes for all objects kept in the session. (Original exception: uninitialized constant ActionController::Flash::FlashHash [NameError]) ): actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:62:in `rescue in rescue in stale_session_check!' actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:58:in `rescue in stale_session_check!' actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:55:in `stale_session_check!' actionpack (3.2.1) lib/action_dispatch/middleware/session/cookie_store.rb:51:in `unpacked_cookie_data' rack (1.4.1) lib/rack/session/cookie.rb:98:in `extract_session_id' actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:51:in `block in extract_session_id' actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:55:in `stale_session_check!' actionpack (3.2.1) lib/action_dispatch/middleware/session/abstract_store.rb:51:in `extract_session_id' rack (1.4.1) lib/rack/session/abstract/id.rb:43:in `load_session_id!' rack (1.4.1) lib/rack/session/abstract/id.rb:32:in `[]' rack (1.4.1) lib/rack/session/abstract/id.rb:262:in `current_session_id' rack (1.4.1) lib/rack/session/abstract/id.rb:268:in `session_exists?' rack (1.4.1) lib/rack/session/abstract/id.rb:107:in `exists?' rack (1.4.1) lib/rack/session/abstract/id.rb:122:in `load_for_read!' rack (1.4.1) lib/rack/session/abstract/id.rb:64:in `has_key?' actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:258:in `ensure in call' actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:259:in `call' rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context' rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/cookies.rb:338:in `call' activerecord (3.2.1) lib/active_record/query_cache.rb:64:in `call' activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `_run__967158296__call__1011983202__callbacks' activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:65:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app' railties (3.2.1) lib/rails/rack/logger.rb:16:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/request_id.rb:22:in `call' rack (1.4.1) lib/rack/methodoverride.rb:21:in `call' rack (1.4.1) lib/rack/runtime.rb:17:in `call' activesupport (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.4.1) lib/rack/lock.rb:15:in `call' actionpack (3.2.1) lib/action_dispatch/middleware/static.rb:53:in `call' railties (3.2.1) lib/rails/engine.rb:479:in `call' railties (3.2.1) lib/rails/application.rb:220:in `call' rack (1.4.1) lib/rack/content_length.rb:14:in `call' railties (3.2.1) lib/rails/rack/log_tailer.rb:14:in `call' rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' Rendered /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.5ms) Rendered /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.6ms) Rendered /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (5.4ms) I have installed RubyGems 1.8.24 and use rbenv to control versions. 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