Recently we created a server for PostgreSQL and we started migrating our systems to that server.

When I tried to do that with redmine I followed these steps:

1 - I created a backup file for the old database server (utf-8)
2 - I created a new database in the new database server (utf-8)
3 - I created a new user in the new database server for the redmine database (with the same name and password from the old server)
4 - I restored the backup file from step 1 in the new database server.
5 - I changed the configuration file from:

production:
  adapter: postgresql
  database: redmine
  host: old_server
  username: redmine
  password: ****
  encoding: utf8 

To:

production:
  adapter: postgresql
  database: redmine
  host: new_server 
  username: redmine
  password: ****
  encoding: utf8 

I restarted the server and when I tried to access redmine I got the following error:

ActionView::TemplateError (undefined method `-' for nil:NilClass) on line #6 of app/views/news/_news.rhtml:
3: <%= "(#{l(:label_x_comments, :count => news.comments_count)})" if news.comments_count > 0 %>
4: <br />
5: <% unless news.summary.blank? %><span class="summary"><%=h news.summary %></span><br /><% end %>
6: <span class="author"><%= authoring news.created_on, news.author %></span></p>
    app/helpers/application_helper.rb:286:in `time_tag'
    app/helpers/application_helper.rb:282:in `authoring'
    app/views/news/_news.rhtml:6:in `_run_rhtml_app47views47news47_news46rhtml_locals_news_news_counter_object'
    app/views/welcome/index.rhtml:8:in `_run_rhtml_app47views47welcome47index46rhtml'
    /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/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/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:441:in `start_request_handler'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:381:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/utils.rb:252:in `safe_fork'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:377: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:222:in `start'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:253: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:247: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:246:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:145:in `spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:278: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 /opt/redmine-1.0/public/500.html (500 Internal Server Error)

What I already did¶

1 - I accessed the PostgreSQL's new server from the redmine server to check if it was a connection problem

psql -h new_server -U redmine

Connection OK!

2 - I tried to run the scripts to reconfigure the database

rake db:migrate RAILS_ENV="production" 
rake redmine:load_default_data RAILS_ENV="production" 

What should I do?¶