Ruby on Rails

More info: I reproduced this in development mode on my OS X machine,
again using Ruby 1.9.2. I now get a stack trace:

Error during failsafe response: ActionView::Template::Error
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
`method_missing'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/http/parameters.rb:10:in
`parameters'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb:3:in
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_view/template.rb:135:in
`block in render'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/notifications.rb:54:in
`instrument'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_view/template.rb:127:in
`render'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:59:in
`block in _render_template'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in
`block in instrument'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/notifications/instrumenter.rb:21:in
`instrument'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in
`instrument'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:56:in
`_render_template'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:26:in
`render'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:88:in
`rescue_action_locally'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:68:in
`render_exception'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:59:in
`rescue in call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:46:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/rack/logger.rb:13:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/rack-1.2.1/lib/rack/runtime.rb:17:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.3/lib/active_support/cache/strategy/local_cache.rb:72:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/rack-1.2.1/lib/rack/lock.rb:11:in
`block in call'
<internal:prelude>:10:in `synchronize'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/actionpack-3.0.3/lib/action_dispatch/middleware/static.rb:30:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/application.rb:168:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/application.rb:77:in
`method_missing'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/rack/log_tailer.rb:14:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/rack-1.2.1/lib/rack/content_length.rb:13:in
`call'
<path>/.rvm/gems/ruby-1.9.2-p136/gems/rack-1.2.1/lib/rack/handler/webrick.rb:52:in
`service'
<path>/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/httpserver.rb:111:in
`service'
<path>/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/httpserver.rb:70:in
`run'
<path>/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/server.rb:183:in
`block in start_thread'

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