Redmine

Some problems in Parent task and Subtasks
when add a task A to a parent task B, it automatically added to an other task C as a subtask, but A & B has no relation.
Delete task C, change the parent task to task D, it cause 500(Interal Server Error)

ActiveRecord::ActiveRecordError (Impossible move, target node cannot be inside moved tree.):
app/models/issue.rb:881:in `update_nested_set_attributes'
app/models/issue.rb:732:in `save_issue_with_child_records'
app/models/issue.rb:719:in `save_issue_with_child_records'
app/controllers/issues_controller.rb:182:in `update'
passenger (3.0.12) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
passenger (3.0.12) lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
passenger (3.0.12) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
passenger (3.0.12) lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
passenger (3.0.12) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
passenger (3.0.12) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
passenger (3.0.12) lib/phusion_passenger/utils.rb:479:in `safe_fork'
passenger (3.0.12) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.12) lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
passenger (3.0.12) lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
passenger (3.0.12) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.12) lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
passenger (3.0.12) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
passenger (3.0.12) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.12) lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
passenger (3.0.12) lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
passenger (3.0.12) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.12) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.12) helper-scripts/passenger-spawn-server:99