ruby-on-rails - 完全なトレースなしで config.consider_all_requests_local を true に設定

Question

私は今日新しいアプリに取り組んでいます。これは私のGemfileです:

source 'https://rubygems.org'

gem 'rails', '3.2.8'

# Static pages
gem 'high_voltage', '0.9.2'

# Dry Controller
gem 'coast'

# Light Views
gem 'slim'
gem 'formtastic'

# Uploading
gem 'paperclip'

# Authentication
gem 'devise'
gem 'cancan'

# Easing models
gem 'enumerize'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'twitter-bootstrap-rails', :git => 'git://github.com/seyhunak/twitter-bootstrap-rails.git'
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
end
group :test, :development do
  gem 'sqlite3'
  gem 'awesome_print'
  # For slim genetaror instead default
  gem 'slim-rails'
  gem 'factory_girl_rails', '~> 4.0'
  gem 'forgery'
end

gem 'jquery-rails'

そして、これは私のenvironment/development.rbからの抜粋です:

config.cache_classes = false
config.whiny_nils = true
config.consider_all_requests_local       = true
config.action_controller.perform_caching = false
config.action_mailer.raise_delivery_errors = false
config.active_support.deprecation = :log
config.action_dispatch.best_standards_support = :builtin
config.active_record.mass_assignment_sanitizer = :strict
config.active_record.auto_explain_threshold_in_seconds = 0.5
config.assets.compress = false
config.assets.debug = true

Slim::Engine.set_default_options pretty: true, sort_attrs: false

たとえば、次のようなエラーのあるページに移動すると:

p
  = @project.envelopedd

通常のデバッグ トレースではなく、500 ページ エラーが発生します。これを修正するアイデアはありますか？