django kwargs are not passed with the view to html template

I searched for hours but I could not find a solution. I am trying to filter conferences by country. Conference detail url works fine when I click on it from the main conference list. When I filter by country, the list of conferences in a given country are shown. However, when I click on a conference, it breaks and shows `Reverse for 'conference-detail' with keyword arguments '{'pk': '', 'slug': ''}' not found. 1 pattern(s) tried: ['conferences\\/details\\/(?P<pk>[0-9]+)\\/(?P<slug>[-a-zA-Z0-9_]+)\\/$']`. I cannot figure out the problem in my code.

Model:
 
    from cities_light.models import Country, City
    class Conference(models.Model):
        title = models.CharField(max_length=512, default='')
        slug = models.SlugField(max_length=512)
        country = models.ForeignKey(Country, on_delete=models.CASCADE)
        city = models.ForeignKey(City, on_delete=models.CASCADE)
       
        def __str__(self):
            return self.title

        def save(self, *args, **kwargs):
            self.slug = slugify(self.title)
            super(Conference, self).save(*args, **kwargs)

        def get_absolute_url(self):
            return reverse('conferences:conference-detail', kwargs={'pk': self.pk, 'slug': self.slug})

urls.py:

 

    path('', views.ConferenceListView.as_view(), name='conference-list'),
    path('details/<int:pk>/<slug:slug>/', views.ConferenceDetailView.as_view(), name='conference-detail'),
    path('country-list', views.ConferenceCountryListView.as_view(),
                                                 name='conference-country-list'),
    path('country/<int:pk>/<slug:slug>/', views.ConferenceByCountryView.as_view(),
                                                 name='conferences-in-single-country'),

Views:

    class ConferenceByCountryView(generic.ListView):
        template_name = 'conferences/conferences_in_country_list.html'
        context_object_name = 'conferences'

        def get_queryset(self, *args, **kwargs):
            country = Country.objects.get(pk=self.kwargs.get('pk', None))
            return Conference.objects.filter(country=country)

        def get_context_data(self, **kwargs):
            context = super(ConferenceByCountryView, self).get_context_data(**kwargs)
            country = Country.objects.get(pk=self.kwargs.get('pk', None))
            context['country'] = country
            context['title'] = 'Conferences in ' + ' country'
            return context


    class ConferenceDetailView(generic.DeleteView):
        model = Conference
        template_name = 'conferences/conference_detail.html'

        def get_context_data(self, **kwargs):
            context = super().get_context_data(**kwargs)
            context['title'] = self.object.title
            context['pk'] = self.object.pk
            context['slug'] = self.object.slug
            return context

In the conference list html, this is the code snippent: `<a href="{% url 'conferences:conference-detail' pk=conference.pk slug=conference.slug %}"><h6>{{ conference.title }}</h6></a>`. It redirects to the conference detail page without any problem. In the conference by country html, I have the following code:

    <ul class="list-group">
                {% for conferenc in conferences %}
                    <a class="list-group-item list-group-item-action"  href="{% url 'conferences:conference-detail' pk=conference.pk slug=conference.slug %}"> {{ conferenc.title }} </a> {%comment%} Here is the problem. {% endcomment %}
                {% endfor %}
                 </ul>

When I click on the url, it raises the following error:

    Reverse for 'conference-detail' with keyword arguments '{'pk': '', 'slug': ''}' not found. 1 pattern(s) tried: ['conferences\\/details\\/(?P<pk>[0-9]+)\\/(?P<slug>[-a-zA-Z0-9_]+)\\/$']

Your kind help is highly appreciated.

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