Multipart upload issue in Rails 3

Error during failsafe response: ActionView::Template::Error
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/http/parameters.rb:10:in `parameters'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb:3:in `___sers_user__rvm_gems_ruby_______p____rails__gems_actionpack_______lib_action_dispatch_middleware_templates_rescues_diagnostics_erb___431431574_2173037080_0'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/template.rb:135:in `send'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/template.rb:135:in `render'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/notifications.rb:54:in `instrument'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/template.rb:127:in `render'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:59:in `_render_template'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in `instrument'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in `instrument'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:56:in `_render_template'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:26:in `render'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:88:in `rescue_action_locally'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:68:in `render_exception'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:59:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/rack/logger.rb:13:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/runtime.rb:17:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/activesupport-3.0.3/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/lock.rb:11:in `synchronize'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/actionpack-3.0.3/lib/action_dispatch/middleware/static.rb:30:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/application.rb:168:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/application.rb:77:in `send'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/application.rb:77:in `method_missing'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/rack/log_tailer.rb:14:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/content_length.rb:13:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/chunked.rb:15:in `call'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/handler/mongrel.rb:67:in `process'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/handler/mongrel.rb:38:in `run'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/rack-1.2.1/lib/rack/server.rb:213:in `start'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/commands/server.rb:65:in `start'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/commands.rb:30
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
  /Users/user/.rvm/gems/ruby-1.8.7-p302@rails3/gems/railties-3.0.3/lib/rails/commands.rb:27
  script/rails:6:in `require'
  script/rails:6


Started POST "/payments/mms" for 127.0.0.1 at Tue Dec 14 22:30:19 +0100 2010

NoMethodError (undefined method `rewind' for "Test.":String):