Redmine

Processing UsersController#show (for 192.168.168.2 at 2010-12-04 05:40:42) [GET]
Parameters: {"action"=>"show", "id"=>"3", "controller"=>"users"}
Rendering template within layouts/base
Rendering users/show

ActionView::TemplateError (No builder for format ) on line #1 of app/views/users/show.apit:
1: api.user do
2: api.id @user.id
3: api.login @user.login if User.current.admin?
4: api.firstname @user.firstname

lib/redmine/views/builders.rb:25:in `for'
    app/views/users/show.apit:1:in `_run_apit_app47views47users47show46apit'
    app/controllers/users_controller.rb:73
    app/controllers/users_controller.rb:72:in `show'
    public/dispatch.fcgi:24

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

Ruby version 1.8.7 (i486-linux)
RubyGems version 1.3.7
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
Application root /www/redmine
Environment production
Database adapter mysql
Database schema version 20101114115359

About your Redmine plugins
Redmine Graphs plugin 0.1.0
Redmine Question plugin 0.3.0
Stuff To Do Plugin 0.3.0
Redmine Reports plugin 0.1.0