Django Primary Key: badly formed hexadecimal UUID string

Question

I'm trying to use UUIDField as a primary key for a model. I'm using CreateView for creating objects for this model.

Anytime I browse to the url for creating one of the objects I get the error:

badly formed hexadecimal UUID string

The stack trace shows the error occurs here, where value is created:

/home/conor/django/venv2/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py in get_db_prep_value

        return name, path, args, kwargs

    def get_internal_type(self):
        return "UUIDField"

    def get_db_prep_value(self, value, connection, prepared=False):
        if isinstance(value, six.string_types):
                        value = uuid.UUID(value.replace('-', ''))
 ...
        if isinstance(value, uuid.UUID):
            if connection.features.has_native_uuid_field:
                return value
            return value.hex
        return value

Here is my model:

class InvoicePayment(models.Model):
invoice_payment_id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
invoice = models.ForeignKey('Invoice')
date_paid = models.DateField(auto_now=False, auto_now_add=False, blank=False, null=True)
payment_type = models.CharField(max_length=100)
amount = models.DecimalField(max_digits=9, decimal_places=3)
balance = models.DecimalField(max_digits=9, decimal_places=3)

def __str__(self):
    return '%s' % (self.invoice_payment_id)

class Meta:
    verbose_name = _("Invoice Payment")
    verbose_name_plural = _("Invoice Payments")

My view:

class InvoicePaymentCreateView(CreateView):
    model = InvoicePayment
    form_class = AddInvoicePaymentForm
    template_name = 'payment_add.html'

And my form (I'm using crispy forms):

class AddInvoicePaymentForm(ModelForm):
helper = FormHelper()
helper.layout = Layout(
    HTML("<legend>Invoice Payment</legend>"),
     Div(
         Div('invoice_payment', 'payment_type',
             'amount', 'balance',                 
              Field('date_paid', css_class='datepicker'),                  
              css_class='col-md-6 col-md-offset-1'),                                     
     css_class='row'),                                    

     FormActions(
         Submit('save', 'Save changes'),
         Button('cancel', 'Cancel')
     ),         
 )

class Meta:
    model = InvoicePayment     
    fields = '__all__'

What I've tried:

Figured it could have been an old schema issue: recreated database
Python version. Initially used Python 3.4.0, but issue persists in Python 2.7
Creating an object in the django shell, same uuid error
updating my Django from 1.8.3 to 1.8.4

None of this worked. Help!

Django Primary Key: badly formed hexadecimal UUID string

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