Redmine

I'm using the following parts:
ruby 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]
rake, version 10.0.4
rubygem-rails Version: 2.3.14-0.3.1
redmine 2.3.1
MySQL-Server version: 5.1.63-log SUSE MySQL RPM
OS: openSUSE 11.4 (x86_64
No Plugins installed.

When i do the command
rake db:migrate RAILS_ENV=production
in the redmine root-folder i will get the following (with --trace):

• Invoke db:migrate (first_time)
• Invoke environment (first_time)
• Execute environment
  rake aborted!
  Child already added
  /redmine-2.3.1/redmine-2.3.1/lib/redmine/menu_manager.rb:345:in `add_at'
  /redmine-2.3.1/redmine-2.3.1/lib/redmine/menu_manager.rb:362:in `add'
  /redmine-2.3.1/redmine-2.3.1/lib/redmine/menu_manager.rb:280:in `push'
  /redmine-2.3.1/redmine-2.3.1/lib/redmine.rb:200
  /redmine-2.3.1/redmine-2.3.1/lib/redmine/menu_manager.rb:212:in `map'
  /redmine-2.3.1/redmine-2.3.1/lib/redmine.rb:199
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
  /redmine-2.3.1/redmine-2.3.1/config/initializers/30-redmine.rb:4
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `load'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `load'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
  /usr/lib64/ruby/gems/1.8/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `load'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/engine.rb:588
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/engine.rb:587:in `each'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/engine.rb:587
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `run_initializers'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `send'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
  /redmine-2.3.1/redmine-2.3.1/config/environment.rb:14
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/application.rb:103:in `require'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/application.rb:103:in `require_environment!'
  /usr/lib64/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/application.rb:297:in `initialize_tasks'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:246:in `execute'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:184:in `invoke_with_call_chain'
  /usr/lib64/ruby/1.8/monitor.rb:242:in `synchronize'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:205:in `invoke_prerequisites'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:203:in `each'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:183:in `invoke_with_call_chain'
  /usr/lib64/ruby/1.8/monitor.rb:242:in `synchronize'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:101:in `top_level'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:101:in `top_level'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:73:in `run'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
  /usr/lib64/ruby/gems/1.8/gems/rake-10.0.4/bin/rake:33
  /usr/bin/rake:23:in `load'
  /usr/bin/rake:23
  Tasks: TOP => db:migrate => environment

The same output by
RAILS_ENV=production rake about --trace.

I do the upgrade like discribed in
http://www.redmine.org/projects/redmine/wiki/RedmineUpgrade

All i found were answers and fixes for problems with plugins,
but i do not use plugins.