not null constraint failed django

In Django, the "not null constraint failed" error occurs when you try to save a model instance without providing a value for a non-nullable field.

1. Check your model definition to ensure that the problematic field is not set as "null=True" and does not have a default value.
2. Verify that the form or data being submitted includes a value for the non-nullable field.
3. If using a form, make sure the field is included and marked as required.
4. If the field should be optional, consider updating the model or form to allow null values or provide a default value.

This should help resolve the "not null constraint failed" error in your Django application.