problem with globalize3 : undefined method `create_translation_table!'


I have the problem posted at this address :

I created a new project with a new model and I integrated globalize3. I created a migration like this :

     class CreatePages < ActiveRecord::Migration
       def up
         create_table :pages do |t|
         Page.create_translation_table! title: :string, body: :body

       def down
         drop_table :pages

When I migrate I have this error : `undefined method `create_translation_table!' for Page(Table doesn't exist):Class`.

When I rollback I have this error : `undefined method `drop_translation_table!' for #<Class:0x00000001eb4640>`.

I don't know what to do. Do you have a solution?