Session contains objects whose class definition isn\'t available.
Remember to require the classes for all objects kept in the session

I am trying to integrate http://github.com/binarylogic/authlogic for authentication into my rails application . I follwed all the steps into mentioned in the documentation . Now i seem to be getting this error when i hit a controller . Looks like i am missing something obvious .

stacktrace

/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/session/abstract_store.rb:77:in `stale_session_check!'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/session/abstract_store.rb:61:in `load!'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/session/abstract_store.rb:28:in `[]'
/Library/Ruby/Gems/1.8/gems/authlogic-2.1.3/lib/authlogic/session/session.rb:48:in `session_credentials'
/Library/Ruby/Gems/1.8/gems/authlogic-2.1.3/lib/authlogic/session/session.rb:33:in `persist_by_session'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `send'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `evaluate_method'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:166:in `call'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:93:in `run'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `each'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `send'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `run'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:276:in `run_callbacks'
/Library/Ruby/Gems/1.8/gems/authlogic-2.1.3/lib/authlogic/session/callbacks.rb:79:in `persist'
/Library/Ruby/Gems/1.8/gems/authlogic-2.1.3/lib/authlogic/session/persistence.rb:55:in `persisting?'
/Library/Ruby/Gems/1.8/gems/authlogic-2.1.3/lib/authlogic/session/persistence.rb:39:in `find'
/Users/suryagaddipati/myprojects/groceryplanner/app/controllers/application_controller.rb:12:in `current_user_session'
/Users/suryagaddipati/myprojects/groceryplanner/app/controllers/application_controller.rb:17:in `current_user'
/Users/suryagaddipati/myprojects/groceryplanner/app/controllers/application_controller.rb:30:in `require_no_user'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `send'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `evaluate_method'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:166:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:225:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:629:in `run_before_filters'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:615:in `call_filters'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/benchmark.rb:10:in `realtime'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:160:in `perform_action_without_flash'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/flash.rb:146:in `perform_action'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:532:in `send'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:532:in `process_without_filters'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/filters.rb:606:in `process'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:391:in `process'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:386:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:437:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:87:in `dispatch'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:121:in `_call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:9:in `cache'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:28:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/string_coercion.rb:25:in `call'
/Users/suryagaddipati/.gem/ruby/1.8/gems/rack-1.0.1/lib/rack/head.rb:9:in `call'