Error in formatting: AttributeError: 'UUID' object has no attribute 'int'

When trying to render my content_detail.html template (printed below), I am receiving the following error:

• 

• /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/uuid.py in __init__

  160.                 raise ValueError('badly formed hexadecimal UUID string')

       …
  ▼ Local vars

  Variable	Value
  bytes	None
  bytes_le	None
  fields	None
  hex	'2'
  int	None
  is_safe	<SafeUUID.unknown: None>
  self	Error in formatting: AttributeError: 'UUID' object has no attribute 'int'
  version	None

archive/urls.py:

from django.contrib import admin

from django.urls import include, path

from django.views.generic import RedirectView

from django.conf import settings

from django.conf.urls.static import static

urlpatterns = [

    path('posts/', include('posts.urls')),

    path('admin/', admin.site.urls),

    path('', RedirectView.as_view(url='posts/', permanent=True)),] + static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)

archive/posts/urls.py:

from django.urls import path

from . import views

app_name = 'posts'

urlpatterns = [

    path('', views.index, name='index'),

    path('<int:pk>/', views.ContentDetailView.as_view(), name='content-detail'),

]

archive/posts/models.py:

import datetime

from django.db import models

from django.utils import timezone

import uuid

from django.urls import reverse

# Create your models here.

class Content(models.Model):

    title = models.CharField(max_length=200)

    pub_date = models.DateTimeField(null=True, blank=True)

    def __str__(self):

        return self.title

    def get_absolute_url(self):

        return reverse('content-detail', args=[str(self.id)])

class ContentInstance(models.Model):

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    content = models.ForeignKey(Content, on_delete=models.SET_NULL, null=True)

    text = models.TextField()

    def __str__(self):

        return '{0} ({1})'.format(self.id, self.content.title)

archive/posts/views.py:

from django.shortcuts import render

# Create your views here.

from .models import Content, ContentInstance

from django.views import generic

def index(request):

    archive_list = Content.objects.order_by('-pub_date')

    context = {'archive_list': archive_list}

    return render(request, 'index.html', context)

class ContentDetailView(generic.DetailView):

    model = Content

archive/posts/templates/posts/content_detail.py:

{% extends "base_generic.html" %}

{% block content %}

  <h1>Heading</h1>

  <h2>{{ content.title }}</h2>

  <p>{{ content.pub_date }}</p>

  <ul>

  {% for copy in content.contentinstance_set.all %} 

  <li><{{ copy.text }}></li>

  {% endfor %}

  </ul>

{% endblock %}

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