Django url path not routing properly

    NoReverseMatch at /post/comment/1
    Reverse for 'comment-reply' with arguments '('',)' not found. 1 pattern(s) tried: ['post/comment/reply/(?P<pk>[0-9]+)\\Z']
    
    path('post/<slug:slug>/comment/create', CommentCreate.as_view(), name='post-comment'),
        path('post/comment/reply/<int:pk>', ReplyCreate.as_view(), name='comment-reply'),
        path('post/comment/<int:pk>', CommentDetailView.as_view(), name='comment-detail'),



class ReplyCreate(LoginRequiredMixin, CreateView):
    """
    Form for adding a blog comment. Requires login. 
    """
    model = Reply
    fields = ['description',]

    def get_context_data(self, **kwargs):
        """
        Add associated blog to form template so can display its title in HTML.
        """
        # Call the base implementation first to get a context
        context = super(ReplyCreate, self).get_context_data(**kwargs)
        # Get the blog from id and add it to the context
        context['comment'] = get_object_or_404(Comment2, pk = self.kwargs['pk'])
        return context
        
    def form_valid(self, form):
        """
        Add author and associated blog to form data before setting it as valid (so it is saved to model)
        """
        #Add logged-in user as author of comment
        form.instance.author = self.request.user
        #Associate comment with blog based on passed id
        form.instance.comment=get_object_or_404(Comment2, pk = self.kwargs['pk'])
        # Call super-class form validation behaviour
        return super(ReplyCreate, self).form_valid(form)

    def get_success_url(self): 
        """
        After posting comment return to associated blog.
        """
        return reverse('detail2', kwargs={'slug': self.kwargs['slug'],})




class CommentDetailView(LoginRequiredMixin,generic.DetailView):
    model = Comment2


comment2_detault.html:

{% extends 'blog/basedetail.html' %}

{% block content %}
<div class="card mb-3">
  <div class="card-body">
    <div class="card-title fw-bold">{{ comment.author }} | ({{ comment.post_date }})</div>
    <p class="card-text">{{ comment.description }}</p>
  </div>
</div>

<div class="d-flex justify-content-start align-items-center">
  <h4 class="my-2 me-3"><i class="fa-solid fa-comments"></i> Reply</h4>
  <a href="#replybox" class="text-success"><i class="fa-solid fa-pen-to-square fa-lg m-1"></i></a>
</div>

<ul class="list-group list-group-flush" style="height: 65vh; overflow-y: auto;">
  {% for reply in comment.reply_set.all %}
  <li class="list-group-item d-flex justify-content-between align-items-start shadow-sm m-2">
    <div class="ms-2 me-auto">
      <div class="d-flex justify-content-start m-1">
        <div class="btn btn-secondary btn-sm mx-3"><i class="fas fa-user me-1"></i>{{ reply.author }}</div>
        <div class="text-muted">({{ reply.post_date }})</div>
      </div>
      <p class="card-text mx-3 my-2">{{ reply.description }}</p>
      <a href="{% url 'comment-reply' comment.id %}" class="btn btn-success btn-sm">Add a new Reply</a>
    </div>
  </li>
  {% endfor %}
</ul>

<div class="d-flex justify-content-start align-items-center m-4" id="replybox">
  {% if user.is_authenticated %}
  <a href="{% url 'comment-reply' comment.id %}" class="btn btn-success btn-sm">Add a new Reply</a>
  {% else %}
  <a href="{% url 'login' %}?next={{ request.path }}" class="btn btn-success btn-sm">Login to add a new reply</a>
  {% endif %}
  <a href="{% url 'newblog9' %}" class="mx-3 btn btn-danger btn-sm"><i class="fa-solid fa-ban"></i></a>
</div>
{% endblock %}

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