Rails - Oct 2006 - Fixtures Load Error

When I run the following file:
  
require ''active_record/fixtures'' 
  require ''Order''
  
    class LoadOrdersData < ActiveRecord::Migration 
      def self.up 
        down 
          f = Fixtures.new(Orders.connection, # a database connection 
                          "orders", # table name 
                           Order, # model class 
                           File.join(File.dirname(__FILE__),
"dev_data/orders"))
          f.insert_fixtures 
    end 

    def self.down 
      Order.delete_all 
    end 
  end 
 
I am getting the following error:

LoadError: no such file to load — active_record/fixtures

method require	in 003_load_orders_data.rb at line 1
at top level	in 003_load_orders_data.rb at line 1

I ran the rake rails:freeze:edge but it gives the same error message. How can I
fix this error? TIA.

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