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

Hi, I have a problem since I tried to use get_absolute_url(self): to enter in a url beyond a photo.

When I used <a href="{{ course.get_absolute_url }}">, 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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