Kind of stuck with new version of ferret gem

#{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:201:in
send' #{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:201:inrebuild_index’
#{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:198:in
rebuild_index' #{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:197:inrebuild_index’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/connection_adapters/abstract/database_statements.rb:59:in
transaction' /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/transactions.rb:95:intransaction’
#{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:196:in
rebuild_index' #{RAILS_ROOT}/vendor/plugins/acts_as_ferret/lib/class_methods.rb:194:inrebuild_index’
#{RAILS_ROOT}/app/controllers/tristate_controller.rb:13:in `index’

what am i missing? ive read that i may need to rebuild my old indexeses
from previous version of ferret since they get corrupted during
upgrades? do i just do mode.rebuild_index or do i delete it?

nevermind fixed it…added the mssing code to the methods file. google is
awesome!