Ruby on Rails

NameError: undefined method `content' for class `LibraryFramework'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/core_ext/module/aliasing.rb:32:in `alias_method'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/core_ext/module/aliasing.rb:32:in `alias_method_chain'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/library_framework.rb:134:in `<class:LibraryFramework>'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/library_framework.rb:2:in `<top (required)>'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:443:in `load'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:443:in `block in load_file'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:633:in `new_constants_in'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:442:in `load_file'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:342:in `require_or_load'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:480:in `load_missing_constant'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:180:in `const_missing'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/sec.rb:1:in `<top (required)>'

class LibraryFramework < ActiveRecord::Base
  self.abstract_class = true

  def content_with_corrector
    justified = self.class.justify_content(content_without_corrector)
    self.class.check_replace_invalid_format(justified)
  end
  alias_method_chain :content, :corrector

end

class Sec < LibraryFramework
  BANNER = 'Taxation'
  MIN_YEAR = 1980

  validates :docdate, date: true,
            inclusion: {
                in: Date.new(MIN_YEAR)..Time.now.to_date,
                message: "The date must be between #{Date.new(MIN_YEAR)} and #{Time.now.to_date}"},
            :if => lambda{ |object| object.doc_date.present? }
  validates :year, :inclusion => { :in => MIN_YEAR..(Time.now.year),
                                   :message => "The year must be between #{MIN_YEAR} and #{Time.now.year}" },
            :if => lambda{ |object| object.year.present? }

end