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ERROR: test_client_start (usertests.tests.DatabaseTest)
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Traceback (most recent call last):
  File "/Users/schmitch/PycharmProjects/django2/django/db/backends/utils.py", line 63, in execute
    return self.cursor.execute(sql, params)
psycopg2.IntegrityError: duplicate key value violates unique constraint "django_content_type_app_label_model_key"
DETAIL:  Key (app_label, model)=(admin, logentry) already exists.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/schmitch/PycharmProjects/django2/django/test/testcases.py", line 182, in __call__
    self._post_teardown()
  File "/Users/schmitch/PycharmProjects/django2/django/test/testcases.py", line 831, in _post_teardown
    self._fixture_teardown()
  File "/Users/schmitch/PycharmProjects/django2/django/test/testcases.py", line 866, in _fixture_teardown
    connections[db_name]._test_serialized_contents
  File "/Users/schmitch/PycharmProjects/django2/django/db/backends/creation.py", line 412, in deserialize_db_from_string
    obj.save()
  File "/Users/schmitch/PycharmProjects/django2/django/core/serializers/base.py", line 173, in save
    models.Model.save_base(self.object, using=using, raw=True)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/base.py", line 622, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/base.py", line 703, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/base.py", line 736, in _do_insert
    using=using, raw=raw)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/manager.py", line 80, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/query.py", line 915, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/Users/schmitch/PycharmProjects/django2/django/db/models/sql/compiler.py", line 919, in execute_sql
    cursor.execute(sql, params)
  File "/Users/schmitch/PycharmProjects/django2/django/db/backends/utils.py", line 63, in execute
    return self.cursor.execute(sql, params)
  File "/Users/schmitch/PycharmProjects/django2/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/Users/schmitch/PycharmProjects/django2/django/utils/six.py", line 549, in reraise
    raise value.with_traceback(tb)
  File "/Users/schmitch/PycharmProjects/django2/django/db/backends/utils.py", line 63, in execute
    return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: duplicate key value violates unique constraint "django_content_type_app_label_model_key"
DETAIL:  Key (app_label, model)=(admin, logentry) already exists.