session with oracle

Hi....

I've created the session table with 'rake db:sessions:create' and it's
ok but when my application start it doesn't work!!
-Ruby version 1.8.6
-Rails version 2.0.2

this is my development.log....

e[4;35;1mSQL (0.000000)e[0m e[0mSELECT version FROM schema_infoe[0m
Completed in 0.04700 (21 reqs/sec) | Rendering: 0.00000 (0%) | DB:
0.00000 (0%) | 200 OK [http://127.0.0.1/rails/info/properties]
  e[4;36;1mSQL (0.016000)e[0m e[0;1mselect lower(table_name) from
user_tablese[0m
/!\ FAILSAFE /!\ Fri Apr 04 12:10:43 +0200 2008
  Status: 500 Internal Server Error
  undefined local variable or method `generated_methods' for
#<Class:0x38551d0>
    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:1532:in
`method_missing'
    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:1118:in
`reset_column_information'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session/active_record_store.rb:104:in
`setup_sessid_compatibility!'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session/active_record_store.rb:79:in
`find_by_session_id'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session/active_record_store.rb:284:in
`initialize'
    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:1198:in
`silence'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session/active_record_store.rb:284:in
`initialize'
    c:/ruby/lib/ruby/1.8/cgi/session.rb:273:in `new'
    c:/ruby/lib/ruby/1.8/cgi/session.rb:273:in
`initialize_without_cgi_reader'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_ext/session.rb:39:in
`initialize'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_process.rb:130:in
`new'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_process.rb:130:in
`session'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_process.rb:166:in
`stale_session_check!'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_process.rb:114:in
`session'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1131:in
`assign_shortcuts_without_flash'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/flash.rb:167:in
`assign_shortcuts'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:518:in
`process_without_filters'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:685:in
`process_without_session_management_support'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session_management.rb:123:in
`process'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:388:in
`process'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:171:in
`handle_request'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:115:in
`dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:126:in
`dispatch_cgi'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:9:in
`dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2-/lib/webrick_server.rb:112:in
`handle_dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2-/lib/webrick_server.rb:78:in
`service'
    c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2-/lib/webrick_server.rb:62:in
`dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2-/lib/commands/servers/webrick.rb:66
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
    c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
`require'
    c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
`new_constants_in'
    c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
`require'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2-/lib/commands/server.rb:39
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
    ./script/server:3
    -e:2:in `load'
    -e:2

tks for help

Tiziano