data migration issue

When I try to load data into a migration I get the following error message:

[RuntimeException]                                                          
  Cannot insert row, some of the primary key values are missing. Got (, ), ex  
  pecting (article_id, tag_id)

from this code:

<?php
use Cake\ORM\TableRegistry;
use Phinx\Migration\AbstractMigration;

class SeedMigration extends AbstractMigration
{
    public function change()
    {
       $this->table('articles_tags', ['id' => false, 'primary_key' => ['article_id', 'tag_id']])
            ->addColumn('article_id', 'integer')
            ->addForeignKey('article_id', 'articles', 'id')
            ->addColumn('tag_id', 'integer')
            ->addForeignKey('tag_id', 'tags', 'id')
            ->save();
       $articlesTags = TableRegistry::get('ArticlesTags');
            $articleTag = [
                'article_id' => 1,
                'tag_id' => 1,
            ];
       $articlesTags->save($articlesTags->newEntity($articleTag));
    }
}

NOTE: Articles and Tags are created before and there are data with id 1

regards --cesar

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