Noob error on installation

Got RoR running okay on my A2 hosting plan with radiant gem installed.
Followed directions from
http://dev.radiantcms.org/radiant/wiki/Installation and get the
following when the Radiant app starts. Any help is greatly appreciated:

NameError

uninitialized constant SiteController

RAILS_ROOT: …/config/…
Application Trace | Framework Trace | Full Trace

/usr/lib64/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
const_missing' /usr/lib64/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
generated/routing/recognition.rb:339:in recognize_path' /usr/lib64/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:511:in recognize!’
/usr/lib64/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in
`dispatch’
dispatch.cgi:10

/usr/lib64/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
const_missing' /usr/lib64/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
generated/routing/recognition.rb:339:in `recognize_path’

/usr/lib64/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:511:in
recognize!' /usr/lib64/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in dispatch’
dispatch.cgi:10

This error occured while loading the following files:
site_controller.rb