Redmine

Hello,

I have tried to upgrade to Redmine 2.1 and have come across a 'Child already added' error. I am aware 2.1 has not been released yet but I've performed the upgrade fine on one server so I know it works (and works well) but on our live server we encountered this problem. I've attached the full stack trace error message we got. It seems more likely it's something to do with the server rather than Redmine so I don't know if anybody would be able to offer any pointers for this error despite it being a pre-release version. We get the error on any page.

- Ruby implementation and version = 1.8.7 (not sure what is wanted with implementation)
- Rails version (rails --version) = 2.3.14
- Operating system (precise if you're using cygwin when running on Windows) = Ubuntu 11.10
- Database used, and its version = MySQL 5.1
- Ruby-aware server used: Webrick, Mongrel, Thin, etc. If you don't understand this point, you're using Webrick. = Webrick

About your application's environment
Ruby version 1.8.7 (x86_64-linux)
RubyGems version 1.8.24
Rack version 1.1.3
Rails version 2.3.14
Active Record version 2.3.14
Active Resource version 2.3.14
Action Mailer version 2.3.14
Active Support version 2.3.14
Application root /usr/share/redmine
Environment production
Database adapter mysql
Database schema version 20120714122200

Thanks.