Redmine

We are suddenly getting a 500 internal error page when viewing the Redmine Better Gantt chart plugin, version 0.5.3, redmine 1.2.1.

When I view the logs I see
Processing GanttsController#show (for 12.12.12.12 at 2011-10-05 10:04:28) [GET]
Parameters: {"project_id"=>"datacenter", "action"=>"show", "controller"=>"gantts"}

NoMethodError (undefined method `should_apply_for_default_query?' for #<GanttsController:0x7fe5d2861608>):
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/utils.rb:479:in `safe_fork'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:180:in `start'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/data/redmine/passenger/passenger-3.0.5/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/data/redmine/passenger/passenger-3.0.5/helper-scripts/passenger-spawn-server:99

Rendering /data/redmine/redmine/public/500.html (500 Internal Server Error)

Nothing has changed recently as far as we know. Any help is appreciated.