What is a NameError?

Hi,

What is a NameError? When I visit the root page of my application, I get an application error. Upon checking the logs, the stack trace is below. I have also included my environment.rb and routes.rb files, if that's helpful. Any direction you can point me in is most appreciated.

/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:266:in `load_missing_constant': uninitialized constant UserObserver (NameError) from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:452:in `const_missing' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:464:in `const_missing' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/inflector.rb:250:in `constantize' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/core_ext/string/inflections.rb:148:in `constantize' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/ active_record/observer.rb:38:in `instantiate_observers' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/ active_record/observer.rb:36:in `each' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/ active_record/observer.rb:36:in `instantiate_observers' from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb: 212:in `load_observers' from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb: 108:in `process' from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb: 43:in `send' from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb: 43:in `run' from ./../config/environment.rb:13 from dispatch.cgi:3:in `require' from dispatch.cgi:3

===================start environment.rb================================= # Be sure to restart your web server when you modify this file.

# Uncomment below to force Rails into production mode when # you don't control web/app server and can't set it the proper way # ENV['RAILS_ENV'] ||= 'production'

# Specifies gem version of Rails to use when vendor/rails is not present RAILS_GEM_VERSION = '1.2.3' unless defined? RAILS_GEM_VERSION

# Bootstrap the Rails environment, frameworks, and default configuration require File.join(File.dirname(__FILE__), 'boot')

Rails::Initializer.run do |config|   # Settings in config/environments/* take precedence over those specified here

  # Skip frameworks you're not going to use (only works if using vendor/rails)   # config.frameworks -= [ :action_web_service, :action_mailer ]

  # Only load the plugins named here, by default all plugins in vendor/ plugins are loaded   # config.plugins = %W( exception_notification ssl_requirement )

  # Add additional load paths for your own custom dirs   # config.load_paths += %W( #{RAILS_ROOT}/extras )

  # Force all environments to use the same logger level   # (by default production uses :info, the others :debug)   # config.log_level = :debug

  # Use the database for sessions instead of the file system   # (create the session table with 'rake db:sessions:create')   # config.action_controller.session_store = :active_record_store

  # Use SQL instead of Active Record's schema dumper when creating the test database.   # This is necessary if your schema can't be completely dumped by the schema dumper,   # like if you have constraints or database-specific column types   # config.active_record.schema_format = :sql

  # Activate observers that should always be running   # config.active_record.observers = :cacher, :garbage_collector

  # Make Active Record use UTC-base instead of local time   # config.active_record.default_timezone = :utc

  # Add new inflection rules using the following format   # (all these examples are active by default):   # Inflector.inflections do |inflect|   # inflect.plural /^(ox)$/i, '\1en'   # inflect.singular /^(ox)en/i, '\1'   # inflect.irregular 'person', 'people'   # inflect.uncountable %w( fish sheep )   # end

  # See Rails::Configuration for more options end

# Add new mime types for use in respond_to blocks: # Mime::Type.register "text/richtext", :rtf # Mime::Type.register "application/x-mobile", :mobile

# Include your application configuration below ActionMailer::Base.delivery_method = :smtp ActionMailer::Base.smtp_settings = {   :address => "mail.mydomain.us",   :port => 25,   :domain => "mydomain.us",   :user_name => "admin",   :password => "password",   :authentication => :login     } ActionMailer::Base.raise_delivery_errors = true =====================end environment.rb================================

===================start routes.rb================================= ActionController::Routing::Routes.draw do |map|   # The priority is based upon order of creation: first created -> highest priority.

  # Sample of regular route:   # map.connect 'products/:id', :controller => 'catalog', :action => 'view'   # Keep in mind you can assign values other than :controller and :action

  # Sample of named route:   # map.purchase 'products/:id/purchase', :controller => 'catalog', :action => 'purchase'   # This route can be invoked with purchase_url(:id => product.id)

  # You can have the root of your site routed by hooking up ''   # -- just remember to delete public/index.html.   map.connect '', :controller => 'application', :action => 'index'

  # Allow downloading Web Service WSDL as a file with an extension   # instead of a file named 'wsdl'   map.connect ':controller/service.wsdl', :action => 'wsdl'

  # Install the default route as the lowest priority.   map.connect ':controller/:action/:id.:format'   map.connect ':controller/:action/:id'

  map.page ':permalink', :controller => 'page', :action => 'show'   map.signup 'easy_order/signup', :controller => 'page', :action => 'signup'

end =====================end routes.rb================================

Hi,

What is a NameError? When I visit the root page of my application, I get an application error. Upon checking the logs, the stack trace is below. I have also included my environment.rb and routes.rb files, if that's helpful. Any direction you can point me in is most appreciated.

NameError means 'I couldn't find that'. do you have a file
user_observer.rb defining a UserObserver class ?

Fred