Redmine

Hello,

I just moved my entire redmine environment to another server and to preserve the data i copied the database over.
Everything works except the issues, when I press the issues tab i get the following:

login as: root
root@192.168.0.37's password:
Access denied
root@192.168.0.37's password:
Last login: Mon Jun 28 16:22:43 2010
[root@localhost ~]# vim /etc/httpd/logs/error_log
[root@localhost ~]# vim /etc/httpd/logs/access_log
[root@localhost ~]# vim /opt/redmine/log/production.log

Processing WelcomeController#index (for 192.168.0.18 at 2010-06-28 16:56:18) [GET]
  Parameters: {"action"=>"index", "controller"=>"welcome"}
Rendering template within layouts/base
Rendering welcome/index
Completed in 48ms (View: 40, DB: 2) | 200 OK [http://192.168.0.37/]

Processing ProjectsController#index (for 192.168.0.18 at 2010-06-28 16:56:20) [GET]
  Parameters: {"action"=>"index", "controller"=>"projects"}
Rendering template within layouts/base
Rendering projects/index
Completed in 90ms (View: 82, DB: 4) | 200 OK [http://192.168.0.37/projects]

Processing ProjectsController#show (for 192.168.0.18 at 2010-06-28 16:56:21) [GET]
  Parameters: {"action"=>"show", "id"=>"externalbugs", "controller"=>"projects"}
Rendering template within layouts/base
Rendering projects/show
Completed in 85ms (View: 50, DB: 10) | 200 OK [http://192.168.0.37/projects/externalbugs]

Processing IssuesController#index (for 192.168.0.18 at 2010-06-28 16:56:22) [GET]
  Parameters: {"project_id"=>"externalbugs", "action"=>"index", "controller"=>"issues"}
Rendering template within layouts/base
Rendering issues/index.rhtml

ActionView::TemplateError (undefined method `-' for nil:NilClass) on line #16 of app/views/issues/_list.rhtml:
13:     </tr></thead>
14:     <% previous_group = false %>
15:     <tbody>
16:     <% issue_list(issues) do |issue, level| -%>
17:   <% if @query.grouped? && (group = @query.group_by_column.value(issue)) != previous_group %>
18:     <% reset_cycle %>
19:     <tr class="group open">

    app/helpers/issues_helper.rb:28:in `issue_list'
    app/helpers/issues_helper.rb:23:in `each'
    app/helpers/issues_helper.rb:23:in `issue_list'
    app/views/issues/_list.rhtml:16:in `_run_rhtml_app47views47issues47_list46rhtml_locals_issues_list_object_query'
    app/views/issues/_list.rhtml:1:in `_run_rhtml_app47views47issues47_list46rhtml_locals_issues_list_object_query'
    app/views/issues/index.rhtml:62:in `_run_rhtml_app47views47issues47index46rhtml'
    app/controllers/issues_controller.rb:83:in `index'
    app/controllers/issues_controller.rb:82:in `index'
    passenger (2.2.15) lib/phusion_passenger/rack/request_handler.rb:92:in `process_request'
    passenger (2.2.15) lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
    passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:441:in `start_request_handler'
    passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:381:in `handle_spawn_application'
    passenger (2.2.15) lib/phusion_passenger/utils.rb:252:in `safe_fork'
    passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:377:in `handle_spawn_application'
    passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `__send__'
    passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
    passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:163:in `start'
    passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:222:in `start'
    passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rails_application'
    passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add'
    passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:247:in `spawn_rails_application'
                                                                                                                                           1966,0-1      98%

Could this be because I've removed a plugin?