Error: int() argument must be a string or a number, not 'SimpleLazyObject'

Hi I am having this error while I am trying to delete session and cart by IDs after order fulfillment.

carts/views.py

class CheckoutFinalView(CartOrderMixin, View):
    def post(self, request, *args, **kwargs):
        order = self.get_order()
        order_id = order.id
        print order_id

        pay_method = request.POST.get("paymethod")
        print pay_method
        order.save()

        if request.POST.get('paymethod') == "CashOnDelivery":
            order.mark_completed(order_id)
            messages.success(request, "Thank you for your order")
            del request.session["cart_id"]
            del request.session["order_id"]
        elif request.POST.get("paymethod") == 'CreditCard':
            order.mark_completed(order_id)
            messages.success(request, "Thank you for your order")
            del request.session['order_id']
            del request.session['cart_id']
        else:
            return redirect("order_detail", pk=order.pk)

In my orders/models.py:

order_id = models.CharField(max_length=20, null=True, blank=True)
    paymethod = models.CharField(max_length=16, choices=CHOICES, default='CashOnDelivery')

My orders/views.py:

class CashOnDelivery(FormView):
    model = Order
    form_class = PaymentForm
    template_name = 'orders/payment_method.html'
    success_url = '/checkout/final'

My orders/forms.py:

class PaymentForm(forms.ModelForm):
    class Meta:
        model = Order
        fields = [
            'paymethod'
        ]

My carts/checkout.html:

{% extends 'base.html' %}
{% load crispy_forms_tags %}
{% block content %}

<form method='POST' action="{% url 'checkout_final' %}">{% csrf_token %}
 <!--<input type='hidden' name='payment_token' value='ABC' />-->
<!--if method selected then cod should not display-->

    {{ paymentform|crispy }}


 <p><b><button type='submit'>Complete Order</button></b>
    </p>

    </form>
{% endblock %}.

Finally my complete traceback:

> Traceback:
> File "C:\Users\Shazia\dd\lib\site-packages\django\core\handlers\base.py" in get_response
>   132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
> File "C:\Users\Shazia\dd\lib\site-packages\django\views\generic\base.py" in view
>   71.             return self.dispatch(request, *args, **kwargs)
> File "C:\Users\Shazia\dd\src\orders\views.py" in dispatch
>   27.             user_checkout = UserCheckout.objects.get(user=request.user)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\manager.py" in manager_method
>   127.                 return getattr(self.get_queryset(), name)(*args, **kwargs)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\query.py" in get
>   325.         clone = self.filter(*args, **kwargs)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\query.py" in filter
>   679.         return self._filter_or_exclude(False, *args, **kwargs)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\query.py" in _filter_or_exclude
>   697.             clone.query.add_q(Q(*args, **kwargs))
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\sql\query.py" in add_q
>   1310.         clause, require_inner = self._add_q(where_part, self.used_aliases)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\sql\query.py" in _add_q
>   1338.                     allow_joins=allow_joins, split_subq=split_subq,
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\sql\query.py" in build_filter
>   1200.                                                     lookups, value)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\fields\related.py" in get_lookup_constraint
>   1745.                     lookup_class(target.get_col(alias, source), val), AND)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\lookups.py" in __init__
>   101.         self.rhs = self.get_prep_lookup()
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\lookups.py" in get_prep_lookup
>   139.         return self.lhs.output_field.get_prep_lookup(self.lookup_name, self.rhs)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_lookup
>   727.             return self.get_prep_value(value)
> File "C:\Users\Shazia\dd\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_value
>   985.         return int(value)
>
> Exception Type: TypeError at /orders/4/
> Exception Value: int() argument must be a string or a number, not 'SimpleLazyObject'

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