undefined method assets in rails 4 in production mode - ruby-on-rails-3

Question

If i run my rails in production mode using rails s -e production getting error as
Unsupported rails environment for compass
/home/user/.rvm/gems/ruby-2.0.0-p247#global/gems/railties-4.0.0/lib/rails/railtie/configuration.rb:95:in `method_missing': undefined method `asset' for #<Rails::Application::Configuration:0x93d2468> (NoMethodError)
from /home/user/Documents/site/mysite/config/application.rb:41:in `<class:Application>'
from /home/user/Documents/site/mysite/config/application.rb:18:in `<module:Admin>'
from /home/user/Documents/site/mysite/config/application.rb:17:in `<top (required)>'
from /home/user/.rvm/gems/ruby-2.0.0-p247#global/gems/railties-4.0.0/lib/rails/commands.rb:76:in `require'
from /home/user/.rvm/gems/ruby-2.0.0-p247#global/gems/railties-4.0.0/lib/rails/commands.rb:76:in `block in <top (required)>'
from /home/user/.rvm/gems/ruby-2.0.0-p247#global/gems/railties-4.0.0/lib/rails/commands.rb:73:in `tap'
from /home/user/.rvm/gems/ruby-2.0.0-p247#global/gems/railties-4.0.0/lib/rails/commands.rb:73:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
Here is my application.rb
require File.expand_path('../boot', __FILE__)
# require 'rails/all'
# Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
# require "active_resource/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(:default, :assets, Rails.env)
module Admin
class Application < Rails::Application
# Configure the default encoding used in templates for Ruby 1.9.
config.encoding = "utf-8"
# Configure sensitive parameters which will be filtered from the log file.
config.filter_parameters += [:password]
# Enable escaping HTML in JSON.
config.active_support.escape_html_entities_in_json = true
# Use SQL instead of Active Record's schema dumper when creating the 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
# Enforce whitelist mode for mass assignment.
# This will create an empty whitelist of attributes available for mass-assignment for all models
# in your app. As such, your models will need to explicitly whitelist or blacklist accessible
# parameters by using an attr_accessible or attr_protected declaration.
config.active_record.whitelist_attributes = true
# Enable the asset pipeline
config.asset.enable = true
# Version of your assets, change this if you want to expire all your assets
config.assets.version = '1.0'
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'
# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de
end
end

Answer 1

You simply have a typo - it should be config.assets.enable, not config.asset.enable.
See http://guides.rubyonrails.org/asset_pipeline.html#what-is-the-asset-pipeline-questionmark for more information.