root:/usr/share/redmine# bundle exec rake db:migrate_plugins RAILS_ENV=production
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from /usr/share/redmine/vendor/rails/railties/lib/rails/gem_dependency.rb:21.
rake aborted!
undefined method `session=' for ActionController::Base:Class

Tasks: TOP => db:migrate_plugins => environment
(See full trace by running task with --trace)