Artweb-design adva cms

after installing adva into a basic rails app, i generated the following error:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.select

Extracted source (around line #13):

10: 
11:     = stylesheet_link_merged :base
12:     = yield :css
13:   
14:     /[if IE]
15:       = stylesheet_link_merged :ie
16:       

RAILS_ROOT: /home/micah/work/rumsey
Application Trace | Framework Trace | Full Trace

/home/micah/work/rumsey/vendor/plugins/adva_cms/lib/rails_ext/action_controller/content_for_assignments.rb:31:in `content_assignments_proc'
/home/micah/work/rumsey/app/views/layouts/application.html.haml:13:in `_run_haml_app47views47layouts47application46html46haml'

to get around this, i had to do the following to engines/adva_cms/lib/rails_ext/action_controller/content_for_assignments.rb. i dont fully understand the intent of all this, so i could only hack around it.

@@ -28,11 +28,13 @@ end
 ActionView::Renderable.module_eval do
   def content_assignments_proc_with_content_for_filters(view)
     Proc.new do |*names|
-      contents = view.controller.registered_contents.select { |id, content| content.target == names.first }
-      contents.each do |id, content|
-        # content_for always appends the new content. we might want to have
-        # more finegrained control over that.
-        view.content_for(names.first, content.render(view))
+      if view.controller.registered_contents
+        contents = view.controller.registered_contents.select { |id, content| content.target == names.first }
+        contents.each do |id, content|
+          # content_for always appends the new content. we might want to have
+          # more finegrained control over that.
+          view.content_for(names.first, content.render(view))
+        end
       end
       content_assignments_proc_without_content_for_filters(view).call(*names)
     end

i have several gems and plugins installed, and this only happens on the first load of the rails framework. if i refresh, the error does not reoccur, so i suspect its some sort of loading order issue. if it helps, these are the plugins and gems i have installed:

acts_as_list
adva_activity
adva_blog
adva_cells
adva_cms
adva_comments
adva_rbac
adva_user
asset_packager
cucumber_rails_debug
exception_notification
input_css

config.gem 'faker'
config.gem 'notahat-machinist', :lib => 'machinist', :source => 'http://gems.github.com'
config.gem 'bmabey-email_spec', :lib => 'email_spec', :source => 'http://gems.github.com'
config.gem 'cucumber', :lib => false
config.gem 'webrat', :lib => false
config.gem 'rspec-rails', :lib => false
config.gem 'rspec', :lib => false
config.gem 'giraffesoft-resource_controller', :lib => 'resource_controller', :source => 'http://gems.github.com'
config.gem 'chriseppstein-compass', :lib => 'compass', :source => 'http://gems.github.com', :version => '>=0.8.6'
config.gem 'haml', :version => '>=2.2'

what can i do to help track down the cause of this bug?