Error when loading data to database to postgresql

[Wale Olajumoke]

Please how do I fix this error that comes up when loading data. See the error message below.

Thanks

Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.9/site-packages/django/contrib/contenttypes/models.py", line 19, in get_by_natural_key
    ct = self._cache[self.db][(app_label, model)]
KeyError: ('courses', 'course')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/serializers/base.py", line 245, in save_deferred_fields
    value = deserialize_fk_value(field, field_value, using, handle_forward_references=False)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/serializers/base.py", line 310, in deserialize_fk_value
    obj = default_manager.db_manager(using).get_by_natural_key(*field_value)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/contrib/contenttypes/models.py", line 21, in get_by_natural_key
    ct = self.get(app_label=app_label, model=model)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/db/models/query.py", line 435, in get
    raise self.model.DoesNotExist(
django.contrib.contenttypes.models.DoesNotExist: ContentType matching query does not exist.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/manage.py", line 22, in <module>
    main()
  File "/app/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/commands/loaddata.py", line 78, in handle
    self.loaddata(fixture_labels)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/management/commands/loaddata.py", line 125, in loaddata
    obj.save_deferred_fields(using=self.using)
  File "/app/.heroku/python/lib/python3.9/site-packages/django/core/serializers/base.py", line 247, in save_deferred_fields
    raise DeserializationError.WithData(e, label, self.object.pk, field_value)
django.core.serializers.base.DeserializationError: ContentType matching query does not exist.: (admin.logentry:pk=1) field_value was '['courses', 'course']

[Kasper Laudrup]

On 7/15/21 11:05 AM, Wale Olajumoke wrote:
> Please how do I fix this error that comes up when loading data. See the
> error message below.

Reading something like this is a good start:

https://www.propublica.org/nerds/how-to-ask-programming-questions

Kind regards,

Kasper Laudrup