Why can't erase this model object? "AssertionError: Question object can't be deleted because its id attribute is set to None."

I get the following error when attempting to delete an object of my
model...

"AssertionError: Question object can't be deleted because its id
attribute is set to None."

The class definition is thus...

class Question(django.db.models.Model):
"""
Represents a database table.
"""

subject = django.db.models.CharField(max_length = 1000)
section = django.db.models.CharField(max_length = 1000)
text = django.db.models.CharField(max_length = 1000)
answer = django.db.models.CharField(max_length = 1000)
answer_type = django.db.models.CharField(max_length = 1000)

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