Error 500 after attach file

[cyberflow]

Hello,

I use redmine_s3 plugin in redmine 1.2, but some days ago it broken with 500 error if add attach file. In log:

Processing IssuesController#update (for 85.143.161.18 at 2012-10-11 10:24:58) [PUT] Parameters: {"time_entry"=>{"comments"=>"", "activity_id"=>"", "hours"=>""}, "commit"=>"Submit", "notes"=>"test", "action"=>"update", "_method"=>"put", "authenticity_token"=>"LtoTH7DrT01GGidJD1nVmMYv+mRSRuVQRN9hb/5P/n4=", "id"=>"2776", "issue"=>{"start_date"=>"2012-09-29", "custom_field_values"=>{"1"=>""}, "estimated_hours"=>"3", "parent_issue_id"=>"", "priority_id"=>"7", "is_private"=>"0", "lock_version"=>"15", "assigned_to_id"=>"17", "subject"=>"Redmine error 500", "tracker_id"=>"4", "due_date"=>"", "status_id"=>"2", "description"=>"Дим, при попытке прецепить любой файл получаю:\r\n\r\nInternal error\r\n\r\nAn error occurred on the page you were trying to access.\r\nIf you continue to experience problems please contact your Redmine administrator for assistance.\r\n\r\nIf you are the Redmine administrator, check your log files for details about the error.\r\n\r\nПосмотри пожалуйста."}, "controller"=>"issues", "attachments"=>{"1"=>{"file"=>#File:/tmp/RackMultipart20121011-16331-h0o31k-0, "description"=>""}}}

AWS::Errors::Base (AWS::Errors::Base): (eval):3:in head_object' app/models/attachment.rb:148:inattach_files' app/models/attachment.rb:145:in each_value' app/models/attachment.rb:145:inattach_files' app/models/issue.rb:601:in save_issue_with_child_records' app/models/issue.rb:589:insave_issue_with_child_records' app/controllers/issues_controller.rb:175:in update' passenger (3.0.7) lib/phusion_passenger/rack/request_handler.rb:96:inprocess_request' passenger (3.0.7) lib/phusion_passenger/abstract_request_handler.rb:513:in accept_and_process_next_request' passenger (3.0.7) lib/phusion_passenger/abstract_request_handler.rb:274:inmain_loop' passenger (3.0.7) lib/phusion_passenger/classic_rails/application_spawner.rb:321:in start_request_handler' passenger (3.0.7) lib/phusion_passenger/classic_rails/application_spawner.rb:275:insend' passenger (3.0.7) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in handle_spawn_application' passenger (3.0.7) lib/phusion_passenger/utils.rb:479:insafe_fork' passenger (3.0.7) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in handle_spawn_application' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:357:insend' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:357:in server_main_loop' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:206:instart_synchronously' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:180:in start' passenger (3.0.7) lib/phusion_passenger/classic_rails/application_spawner.rb:149:instart' passenger (3.0.7) lib/phusion_passenger/spawn_manager.rb:219:in spawn_rails_application' passenger (3.0.7) lib/phusion_passenger/abstract_server_collection.rb:132:inlookup_or_add' passenger (3.0.7) lib/phusion_passenger/spawn_manager.rb:214:in spawn_rails_application' passenger (3.0.7) lib/phusion_passenger/abstract_server_collection.rb:82:insynchronize' passenger (3.0.7) lib/phusion_passenger/abstract_server_collection.rb:79:in synchronize' passenger (3.0.7) lib/phusion_passenger/spawn_manager.rb:213:inspawn_rails_application' passenger (3.0.7) lib/phusion_passenger/spawn_manager.rb:132:in spawn_application' passenger (3.0.7) lib/phusion_passenger/spawn_manager.rb:275:inhandle_spawn_application' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:357:in __send__' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:357:inserver_main_loop' passenger (3.0.7) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously' passenger (3.0.7) helper-scripts/passenger-spawn-server:99

Rendering /var/www/redmine-1.2/public/500.html (500 Internal Server Error)

What happening?

Thanx for help