rake mutlipart issue in rails 3.0.3

Hi

Right now i’m using rails 3.0.3 and ruby 1.9.3. while running my application i got following error.please give any solution.how to solve this

Completed 200 OK in 348ms (Views: 14.8ms | ActiveRecord: 9.5ms)

Error during failsafe response: ActionView::Template::Error
/home/amp/.rvm/gems/ruby-1.9.3-p547/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in method_missing' /home/amp/.rvm/gems/ruby-1.9.3-p547/gems/actionpack-3.0.3/lib/action_dispatch/http/parameters.rb:10:in parameters’

/home/amp/.rvm/gems/ruby-1.9.3-p547/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb:3:in `__home_amp__rvm_gems_ruby_______p____gems_actionpack_______lib_action_dispatch_middleware_templates_rescues_diagnostics_erb__4083705915605001120_81195560__2207610093201757041’