PDFKit in rails gives service 500 error

Question

I am trying to use pdfkit in windows in my rails 2.3 environment. However the middleware that pdfkit gives some error which causes rails to load the service error. What do i do about this? Are there any alternatives to PDFkit which are easy to use ?

Well i am currently following the Rails screencast on PDFKit. I installed the pdfkit gem ,wkhtmltopdf and then loaded the middleware in the environment.rb file as require 'pdfkit' config.middleware.use "PDFKit::Middleware" then when i go to any page and add the .pdf extension i get the 500 server error

/!\ FAILSAFE /!\ Sun Jul 11 18:42:53 +0530 2010 Status: 500 Internal Server Error private method chomp' called for nil:NilClass C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/whiny_nil.rb:52:inmethod_missing' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/pdfkit-0.3.3/lib/pdfkit/pdfkit.rb:69:in wkhtmltopdf' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/pdfkit-0.3.3/lib/pdfkit/pdfkit.rb:33:ininitialize' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/pdfkit-0.3.3/lib/pdfkit/middleware.rb:25:in new' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/pdfkit-0.3.3/lib/pdfkit/middleware.rb:25:incall' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/string_coercion.rb:25:in call' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/head.rb:9:incall' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/methodoverride.rb:24:in call' C:/Program Files/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:15:incall'