Fixtures Load Error

Rails
1

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 â?? 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.