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

[aetar]

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__
   1. 
      
                      raise ValueError('badly formed hexadecimal UUID string')
      
      …
   ▼ Local vars <http://127.0.0.1:8000/posts/2/#>
   VariableValue
   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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