Redmine

Hey.
I'm having problems when migrating to a new server (old - Debian 6.0, the new ubuntu 11.10). I installed redmine, it works fine with the new database. However, when I load the old database in mysql and I try to go to the projects, I receive the following message:

Internal error. An error occurred on the page you were trying to access. If you continue to experience problems please contact your redMine administrator for assistance.

This is my logs:

ActionView::TemplateError (undefined method `visible?' for #<ActiveRecord::Associations::BelongsToAssociation:0xb576f088>) on line #19 of app/views/projects/show.rhtml:
16:      <li><%=l(:label_subproject_plural)%>:
17:         <%= @subprojects.collect{|p| link_to(h(p), :action => 'show', :id => p)}.join(", ") %></li>
18:   <% end %>
19:     <% @project.visible_custom_field_values.each do |custom_value| %>
20:     <% if !custom_value.value.blank? %>
21:        <li><%= custom_value.custom_field.name%>: <%=h show_value(custom_value) %></li>
22:     <% end %>

    /usr/lib/ruby/vendor_ruby/active_record/associations/association_proxy.rb:217:in `method_missing'
    app/models/custom_value.rb:38:in `visible?'
    /usr/lib/ruby/vendor_ruby/action_view/renderable.rb:91:in `to_proc'
    app/views/projects/show.rhtml:19:in `_run_rhtml_app47views47projects47show46rhtml'
    /usr/lib/ruby/vendor_ruby/action_view/renderable.rb:34:in `send'
    /usr/lib/ruby/vendor_ruby/action_view/renderable.rb:34:in `render'
    /usr/lib/ruby/vendor_ruby/action_view/base.rb:306:in `with_template'
    /usr/lib/ruby/vendor_ruby/action_view/renderable.rb:30:in `render'
    /usr/lib/ruby/vendor_ruby/action_view/template.rb:205:in `render_template'
    /usr/lib/ruby/vendor_ruby/action_view/base.rb:265:in `render'
    /usr/lib/ruby/vendor_ruby/action_view/base.rb:348:in `_render_with_layout'
    /usr/lib/ruby/vendor_ruby/action_view/base.rb:262:in `render'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:1252:in `render_for_file'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:942:in `render_without_benchmark'
    /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:51:in `render'
    /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:51:in `render'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:135:in `send'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:135:in `custom'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:179:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:179:in `respond'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:173:in `each'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:173:in `respond'
    /usr/lib/ruby/vendor_ruby/action_controller/mime_responds.rb:107:in `respond_to'
    app/controllers/projects_controller.rb:165:in `show'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:1333:in `send'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:1333:in `perform_action_without_filters'
    /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:617:in `call_filters'
    /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:610:in `perform_action_without_benchmark'
    /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
    /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
    /usr/lib/ruby/vendor_ruby/action_controller/rescue.rb:160:in `perform_action_without_flash'
    /usr/lib/ruby/vendor_ruby/action_controller/flash.rb:151:in `perform_action'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:532:in `send'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:532:in `process_without_filters'
    /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:606:in `process'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:391:in `process'
    /usr/lib/ruby/vendor_ruby/action_controller/base.rb:386:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/routing/route_set.rb:438:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:87:in `dispatch'
    /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:121:in `_call'
    /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:130:in `build_middleware_stack'
    /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:29:in `call'
    /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:29:in `call'
    /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
    /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:9:in `cache'
    /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:28:in `call'
    /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/string_coercion.rb:25:in `call'
    /usr/lib/ruby/1.8/rack/head.rb:9:in `call'
    /usr/lib/ruby/1.8/rack/methodoverride.rb:24:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/params_parser.rb:15:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/session/cookie_store.rb:99:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/failsafe.rb:26:in `call'
    /usr/lib/ruby/1.8/rack/lock.rb:11:in `call'
    /usr/lib/ruby/1.8/rack/lock.rb:11:in `synchronize'
    /usr/lib/ruby/1.8/rack/lock.rb:11:in `call'
    /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:106:in `call'
    /usr/lib/ruby/1.8/phusion_passenger/rack/request_handler.rb:92:in `process_request'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:418:in `start_request_handler'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:358:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/utils.rb:184:in `safe_fork'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:354:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `__send__'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:163:in `start'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:213:in `start'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:262:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:256:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:80:in `synchronize'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:255:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:154:in `spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:287:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `__send__'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    /usr/lib/phusion_passenger/passenger-spawn-server:61

Rendering /usr/share/redmine/public/500.html (500 Internal Server Error)