Django TypeError: fromisoformat: аргумент должен быть str

введите описание изображения здесь

class UserConfirmation(BaseModel): TYPE_CHOICES = ( (VIA_PHONE, VIA_PHONE), (VIA_EMAIL, VIA_EMAIL) ) code = models.CharField(max_length=4) verify_type = models.CharField(max_length=31, choices=TYPE_CHOICES) user = models.ForeignKey('users.User', models.CASCADE, related_name='verify_codes', db_constraint=False) expiration_time = models.TimeField(null=True) is_confirmed = models.BooleanField(default=False)

def __str__(self):
    return str(self.user.__str__())

def save(self, *args, **kwargs):
    if not self.pk:
        if self.verify_type == VIA_EMAIL:
            self.expiration_tme = datetime.now() + timedelta(minutes=EMAIL_EXPIRE)
        else:
            self.expiration_tme = datetime.now() + timedelta(minutes=PHONE_EXPIRE)
    super(UserConfirmation, self).save(*args, **kwargs)

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