Field defines a relation with model 'Division', which is either not installed, or is abstract. Django

Всем добрый день! У меня выдаётся ошибка:

I have Error: polls.Choice.division_names: (fields.E300) Field defines a relation with model 'Division', which is either not installed, or is abstract

models.py

class Division(models.Model):
    division_id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=200)

    def __str__(self):
        return self.name

    class Meta:
        app_label = 'db'
        db_table = "divisions"

Помогите разобраться.