Odtnhj

I have the next url.py:

from django.urls import path
from . import views
from django.conf.urls import url, include
from django.contrib.auth.decorators import login_required
from two_factor.urls import urlpatterns as tf_urls

urlpatterns = [
 path('', views.index, name='index'),
 url(r'', include(tf_urls)),
 url(r'datasets/$', login_required(views.mostrar_Model_Dataset), name="mostrar_Model_Dataset"),
 url(r'datasets/(d+)/$', login_required(views.mostrar_Model_Dataset), name="mostrar_Model_Dataset_i"),
]

And this view:

def mostrar_Model_Dataset(request, Model_Dataset_id=None):
 conjuntos_datos = Model_Dataset.objects.all()
 ...
 context = "conjuntos_datos": conjuntos_datos,
 "Dataset_id": Dataset_id,
 "datos": paginated_data,
 "fixed_pager": page_range,
 return render(request, 'datasets.html', context)

If I try to access to http://localhost/twitterprojects/datasets/1 or http://localhost/twitterprojects/datasets/20 or http://localhost/twitterprojects/datasets/256 this work fine, but when I try to access to http://localhost/twitterprojects/datasets/ (without argument) I receive the next message:

Exception Type: NoReverseMatch
Exception Value: Reverse for 'mostrar_Model_Dataset' with arguments '(1,)' not found. 1 pattern(s) tried: ['twitterprojects/datasets/$']

some idea?