I have important a mantis project with 126 users. The repository is subversion with only 6 committers. While trying to map the newly created Redmine users to the subversion committers, I get a "500 Internal Server Error" result. The exception is pasted below:

+My Server Setup+
Redmine 0.8 stable (current at of Dec. 14)
Ubuntu 8.04 32bit
Ruby 1.8.6
Rails 2.1.2
Mongrel 1.1.5
MySql 5.0.51a
Apache 2.2 mod_proxy

/!\ FAILSAFE /!\  Mon Dec 15 01:41:16 -0800 2008
  Status: 500 Internal Server Error
  Conflicting types for parameter containers. Expected an instance of Hash but found an instance of Array. This can be caused by colliding Array and Hash parameters like qs[]=value&qs[key]=value. (The parameters received were [""].)
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:725:in `type_conflict!'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:687:in `container'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:678:in `post_key_check'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:654:in `parse'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:641:in `initialize'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:641:in `each'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:641:in `initialize'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:444:in `new'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:444:in `parse_query_parameters'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:401:in `parse_formatted_request_parameters'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/cgi_process.rb:80:in `request_parameters'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:307:in `parameters'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:22:in `request_method'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/request.rb:35:in `method'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route_set.rb:432:in `extract_request_environment'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route_set.rb:385:in `recognize'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:148:in `handle_request'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:107:in `dispatch'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:104:in `synchronize'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:104:in `dispatch'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi'
    /var/lib/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/dispatcher.rb:35:in `dispatch'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:76:in `process'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:74:in `synchronize'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:74:in `process'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:159:in `process_client'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:158:in `each'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:158:in `process_client'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:285:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:285:in `initialize'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:285:in `new'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:285:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:268:in `initialize'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:268:in `new'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:268:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:282:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:281:in `each'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:281:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/command.rb:212:in `run'
    /var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
    /usr/bin/mongrel_rails:16:in `load'
    /usr/bin/mongrel_rails:16