rails: Error "undefined method `accept' for nil:NilClass" after upgrading to rails 3.2

Getting the error undefined method accept’ for nil:NilClass` in my controller. This is on the development environment running on OSX with mysql. Below is the full stack trace and also my bundle/gem setup information.

$ ruby --version
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.0.0]

RAILS FRAMEWORK TRACE

activerecord (3.2.0) lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `to_sql'
activerecord (3.2.0) lib/active_record/connection_adapters/abstract/query_cache.rb:60:in `select_all'
activerecord (3.2.0) lib/active_record/querying.rb:38:in `block in find_by_sql'
activerecord (3.2.0) lib/active_record/explain.rb:38:in `logging_query_plan'
activerecord (3.2.0) lib/active_record/querying.rb:37:in `find_by_sql'
activerecord (3.2.0) lib/active_record/relation.rb:170:in `exec_queries'
activerecord (3.2.0) lib/active_record/relation.rb:159:in `block in to_a'
activerecord (3.2.0) lib/active_record/explain.rb:31:in `logging_query_plan'
activerecord (3.2.0) lib/active_record/relation.rb:158:in `to_a'
activerecord (3.2.0) lib/active_record/relation/finder_methods.rb:377:in `find_first'
activerecord (3.2.0) lib/active_record/relation/finder_methods.rb:122:in `first'
activerecord (3.2.0) lib/active_record/querying.rb:5:in `first'
actionpack (3.2.0) lib/action_controller/metal.rb:246:in `new'
actionpack (3.2.0) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.0) lib/action_dispatch/routing/route_set.rb:66:in `call'
actionpack (3.2.0) lib/action_dispatch/routing/route_set.rb:66:in `dispatch'
actionpack (3.2.0) lib/action_dispatch/routing/route_set.rb:30:in `call'
journey (1.0.0) lib/journey/router.rb:60:in `block in call'
journey (1.0.0) lib/journey/router.rb:48:in `each'
journey (1.0.0) lib/journey/router.rb:48:in `call'
actionpack (3.2.0) lib/action_dispatch/routing/route_set.rb:570:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.0) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.0) lib/active_support/callbacks.rb:405:in `_run__359795530058627940__call__1911828153620681267__callbacks'
activesupport (3.2.0) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.0) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.0) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.0) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.0) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.2.0) lib/rails/engine.rb:479:in `call'
railties (3.2.0) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.0) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.2.0'
gem 'mysql2', '0.2.6'

# Gems used only for assets and not required in production by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer'

  gem 'uglifier', '>= 1.0.3'
end

# Deploy with Capistrano
# gem 'capistrano'

gem 'rabl'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'ruby-debug19', :require => 'ruby-debug'

group :development, :test do
  gem 'annotate'
  gem 'simplecov'
end

BUNDLE show

$ bundle show
Gems included by the bundle:
  * actionmailer (3.2.0)
  * actionpack (3.2.0)
  * activemodel (3.2.0)
  * activerecord (3.2.0)
  * activeresource (3.2.0)
  * activesupport (3.2.0)
  * annotate (2.4.0)
  * arel (3.0.0)
  * builder (3.0.0)
  * bundler (1.0.21)
  * coffee-rails (3.2.1)
  * coffee-script (2.2.0)
  * coffee-script-source (1.2.0)
  * erubis (2.7.0)
  * execjs (1.3.0)
  * hike (1.2.1)
  * i18n (0.6.0)
  * journey (1.0.0)
  * json (1.6.5)
  * mail (2.4.1)
  * mime-types (1.17.2)
  * multi_json (1.0.4)
  * mysql2 (0.2.6)
  * polyglot (0.3.3)
  * rabl (0.5.3)
  * rack (1.4.1)
  * rack-cache (1.1)
  * rack-ssl (1.3.2)
  * rack-test (0.6.1)
  * rails (3.2.0)
  * railties (3.2.0)
  * rake (0.9.2.2)
  * rdoc (3.12)
  * sass (3.1.12)
  * sass-rails (3.2.3)
  * simplecov (0.5.4)
  * simplecov-html (0.5.3)
  * sprockets (2.1.2)
  * thor (0.14.6)
  * tilt (1.3.3)
  * treetop (1.4.10)
  * tzinfo (0.3.31)
  * uglifier (1.2.2)