title: IntegrityError: (1062, "Duplicate entry '3-add_author' for key 2")
body: <p>Database is MySQL.</p>
  
  <p>I use the django.contrib.auth.</p>
  
  <p>Here is all the info:</p>
  
  <blockquote>
    <p>manage.py dumpdata auth > my_auth.json --natural --exclude contenttypes</p>
  </blockquote>
  
  <p>Then I deleted the entire database (drop database my_database), and created a new database (create database new_database)(use ./manage.py syncdb to create all tables).</p>
  
  <p>Then</p>
  
  <blockquote>
    <p>manage.py loaddata my_auth.json</p>
  </blockquote>
  
  <p>I Got an error:</p>
  
  <blockquote>
    <p>IntegrityError: (1062, "Duplicate entry '3-add_author' for key 2")</p>
  </blockquote>
  
  <p>What's the problem?</p>
  
  <p>Any help will be greatly appreciated. Thank you!</p>