Problem in jasper report intrgration with rails application

[Soutom]

hi all,
i want to integrate jasper report with rails application. So i follow
the instruction as given in the following link

http://wiki.rubyonrails.org/rails/pages/HowtoIntegrateJasperReports

But after that when i run this i got the following error

NoMethodError in ReportController#report

undefined method `env' for nil:NilClass
RAILS_ROOT: C:/reporting

Application Trace | Framework Trace | Full Trace
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/
whiny_nil.rb:52:in `method_missing'
C:/reporting/app/helpers/send_doc.rb:7:in `cache_hack'
C:/reporting/app/helpers/send_doc.rb:28:in `send_doc'
C:/reporting/app/controllers/report_controller.rb:6:in `report'

So at now what should i do to solve this error. and how can i recover
this error. ??

[Soutom]

Hi..
please any one help me ...please