Redmine

We are having an problem with when you update an issue it gives an internal error. Looked around and wasn't able to find someone with the similar problem. We are new to redmine as well as ruby so if anyone can give an Idea of what is going on that would be great. This was working fine before, but after adding email notification, i was not able to update any issue.

Here is the log error:

NoMethodError (undefined method `position' for #<Issue:0xb5bf0d8c>):
 app/models/issue.rb:644:in `save_issue_with_child_records'
 app/models/issue.rb:628:in `save_issue_with_child_records'
 app/controllers/issues_controller.rb:180:in `update'
 passenger (3.0.11) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
 passenger (3.0.11) lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
 passenger (3.0.11) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
 passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
 passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
 passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
 passenger (3.0.11) lib/phusion_passenger/utils.rb:479:in `safe_fork'
 passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:180:in `start'
 passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
 passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
 passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
 passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
 passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
 passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
 passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
 passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
 passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
 passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
 passenger (3.0.11) helper-scripts/passenger-spawn-server:99

Thanks ahead of time!