Redmine

I just installed Redmine and added a first project to it. When I try to go to the project's page (i.e. <hostname>/project/<projectname>), I get a 500 error. This is the error in production.log:

Processing ProjectsController#show (for my.ip.goes.here at 2011-05-05 15:36:08) [GET]
  Parameters: {"action"=>"show", "id"=>"my_project_name_here", "controller"=>"projects"}
Rendering template within layouts/base
Rendering projects/show

ActionView::TemplateError (Missing template projects/_members_box.erb in view path app/views) on line #54 of app/views/projects/show.rhtml:
51: </div>
52:
53: <div class="splitcontentright">
54:   <%= render :partial => 'members_box' %>
55:
56:   <% if @news.any? && authorize_for('news', 'index') %>
57:   <div class="news box">

    app/views/projects/show.rhtml:54:in `_run_rhtml_app47views47projects47show46rhtml'
    app/controllers/projects_controller.rb:165:in `show'

Rendering /home/redmine/programs/redmine/1.1.3/public/500.html (500 Internal Server Error)

The file "_members_box.html.erb" is at "/home/redmine/programs/redmine/1.1.3/app/views/projects/".

Here is the output of "RAILS_ENV=production ruby script/about":

About your application's environment
Ruby version              1.8.7 (armv5tel-linux)
RubyGems version          1.3.6
Rack version              1.0
Rails version             2.3.5
Active Record version     2.3.5
Active Resource version   2.3.5
Action Mailer version     2.3.5
Active Support version    2.3.5
Edge Rails revision       unknown
Application root          /home/redmine/programs/redmine/1.1.3
Environment               production
Database adapter          sqlite3
Database schema version   20101114115359

Everything was installed from scratch according to the guide on this website. All other things seem to work (as far as I can test them).