django.urls.exceptions.NoReverseMatch: 'courses' is not a registered namespace

I have a problem since I tried to use get_absolute_url(self): to enter in a url beyond a photo. When I used , my index.html stopped running.

Here I have the top level url.py

from django.contrib import admin  from django.urls import path, include  from simplemooc.core import views, urls  from simplemooc.courses import views, urls  from django.conf import settings  from django.conf.urls.static import static      urlpatterns = [path('admin/', admin.site.urls),                 path('', include(('simplemooc.core.urls', 'simplemooc'), namespace='core')),                 path('cursos', include(('simplemooc.courses.urls', 'simplemooc'), namespace='courses'))]    if settings.DEBUG:      urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

Here courses/url.py

from django.urls import path  from simplemooc.courses import views    urlpatterns = [path('', views.index, name='index'),                     path('/<slug:slug>/', views.details, name='datails')]

Here courses/model.py

from django.db import models  from django.urls import reverse      class CourseManager(models.Manager):        def search(self, query):          return self.get_queryset().filter(              models.Q(name__icontains=query) | \              models.Q(description__icontains=query)          )      class Course(models.Model):        name = models.CharField('Nome', max_length=100)      slug = models.SlugField('Atalho')      description = models.TextField('Descrição Simples', blank=True)      about = models.TextField('Sobre o Curso', blank=True)      start_date = models.DateField(          'Data de Início', null=True, blank=True      )      image = models.ImageField(          upload_to='courses/images', verbose_name='Imagem',          null=True, blank=True      )        created_at = models.DateTimeField(          'Criado em', auto_now_add=True      )      updated_at = models.DateTimeField('Atualizado em', auto_now=True)        objects = CourseManager()        def __str__(self):          return self.name        def get_absolute_url(self):          return reverse('courses:datails', (), {'slug': self.slug})        class Meta:          verbose_name = 'Curso'          verbose_name_plural = 'Cursos'          ordering = ['name']

And here courses/views.py

from django.shortcuts import render, get_object_or_404  from django.http import HttpResponse    from .models import Course    def index(request):      courses = Course.objects.all()      template_name = 'courses\index.html'      context = {          'courses': courses      }      return render(request, template_name, context)      def details(request, slug):     course = get_object_or_404(Course, slug=slug)     context = {         'course': course     }     template_name = 'courses/datails.html'     return render(request, template_name, context)

My problem happens when I use:

<a href="{{ course.get_absolute_url }}">

in my index.html

Please, Anyone can help me?

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