Using Prawn in Rails 2.3.5

Hi

I'm a big fan of Railscasts as I've been using them to further my
learning in Ruby on Rails. I'm a student at Carnegie Mellon University
and I'm having a problem with a gem that I have to use for my class
project. I had followed a tutorial for using Prawn from RailsCasts,
and I followed each and every step from setup to testing it as shown
in the video.

However, when I implemented it, I first got an error 'unitialized
constant Mime::PDF'. I fixed it by adding 'Mime::Type.register_alias
"application/pdf' in /config/initializers/mime_types.rb of my project.
FYI, my current project started off as a scaffold. I also created a
sample .pdf.prawn file with "pdf.text 'Sample PDF output'". Now I get
the following error:

All my routes are pluralized and I'm testing this out on 'index'.
Following is the scaffolded code with the extra line that is supposed
to render the pdf:

def index
    @administrators = Administrator.all

    respond_to do |format|
      format.html # index.html.erb
      format.xml {render :xml => @administrators }
      format.pdf {render :layout => false}
    end
  end

///////
As for the error that takes place when I do http://127.0.0.1:3001/administrator.pdf:
"Routing Error
No route matches "/administrator" with {:method=>:get}"

when I do http://127.0.0.1:3001/administrators.pdf, I get the
following:
"Template is missing
Missing template administrators/index.erb in view path app/views"
//////
Just some info: I have Rails 2.3.5, and doing my development on Aptana
RadRails as it has worked for me before. This is all taking place in
Windows XP.

I will appreciate any help to resolve this. Even a step by step
tutorial that starts afresh.

Ok, I had a lot of issues with this too, so I will just put all the
steps I used to get it to work.

#SETUP
#though I'm sure bundler would be better for this
Installed Prawn gem
config.gem 'prawn', :version => '0.6.3'

Installed Prawnto plugin
./script/plugin install git://github.com/thorny-sun/prawnto.git

#Routes
map.with_options(:controller => 'admin/reports') do |m|
m.admin_marketing_report 'admin/marketing', :controller =>
'admin/reports', :action => 'marketing'
end

#Controller
class Admin::ReportsController < AdminController
  def marketing
    respond_to do |format|
      format.pdf do
        @advertisements = Advertisement.all
      end
    end
  end
end

#VIEW
/admin/reports/marketing.prf.prawn
pdf.text "Marketing Report", :size => 18, :style => :bold

Hopefully this will help you out.

~Jeremy