Nrthugu

I am new to Django. I have found many links matching to this problem, but I did not understand them.
I am creating blog app. Everything was working fine, until I created another app called 'services', and created separate template folders for 'blog', 'services' and 'master'. Now, when I click on 'create new post' in blog app, I get 'Reverse for 'post_publish' with keyword arguments '{'pk': ''}' not found. 1 pattern(s) tried: ['blog/post/(?P[0-9]+)/publish/$']'
Please help me, I do not understand what that error is trying to tell.

Blog_views.py

from django.shortcuts import render, get_object_or_404, redirect

from django.contrib.auth.decorators import login_required

from blog.models import Post, Comment

from django.utils import timezone

from blog.forms import PostForm, CommentForm

from django.views.generic import (TemplateView,ListView,

                                  DetailView,CreateView,

                                  UpdateView,DeleteView)

from django.urls import reverse_lazy

from django.contrib.auth.mixins import LoginRequiredMixin

from django.utils.text import slugify



# Create your views here.



class PostListView(ListView):

    model = Post

    template_name ="blog/blog/post_list.html"



    def get_queryset(self):

        return Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')





class PostDetailView(DetailView):

    model = Post

    template_name ="blog/blog/post_detail.html"





class CreatePostView(LoginRequiredMixin,CreateView):

    login_url = '/login/'

    template_name ="blog/blog/post_detail.html"

    redirect_field_name = 'blog/blog/post_form.html'



    form_class = PostForm

    model = Post

    # template_name ="blog/blog/post_detail.html"





class PostUpdateView(LoginRequiredMixin,UpdateView):

    login_url = '/login/'

    redirect_field_name = 'blog/blog/post_detail.html'



    form_class = PostForm



    model = Post





class DraftListView(LoginRequiredMixin,ListView):

    login_url = '/login/'

    redirect_field_name = 'blog/blog/post_list.html'



    model = Post



    def get_queryset(self):

        return Post.objects.filter(published_date__isnull=True).order_by('created_date')





class PostDeleteView(LoginRequiredMixin,DeleteView):

    model = Post

    success_url = reverse_lazy('blog:post_list')



    #######################################

## Functions that require a pk match ##

#######################################

@login_required

def post_publish(request, pk):

    post = get_object_or_404(Post, pk=pk)

    post.publish()

    return redirect('blog:post_detail', slug=post.slug)



# @login_required

def add_comment_to_post(request, pk):

    post = get_object_or_404(Post, pk=pk)

    if request.method == "POST":

        form = CommentForm(request.POST)

        if form.is_valid():

            comment = form.save(commit=False)

            comment.post = post

            comment.save()

            return redirect('blog:post_detail', slug=post.slug)

    else:

        form = CommentForm()

    return render(request, 'blog/blog/comment_form.html', {'form': form})





@login_required

def comment_approve(request, pk):

    comment = get_object_or_404(Comment, pk=pk)

    comment.approve()

    return redirect('blog:post_detail', slug=comment.post.slug)





@login_required

def comment_remove(request, pk):

    comment = get_object_or_404(Comment, pk=pk)

    post_pk = comment.post.pk

    comment.delete()

    return redirect('blog:post_detail', pk=post_pk)

main_urls.py

from django.contrib import admin

from django.urls import path, include

from django.contrib.auth import views

from django.conf.urls.static import static

from django.conf import settings

from .  import views

urlpatterns = [

    path('admin/', admin.site.urls),

    path('about/', views.AboutView.as_view(), name='about'),

    path('blog/', include('blog.urls', namespace="blog")),

    path('services/', include('services.urls', namespace="services")),

    path('accounts/', include('django.contrib.auth.urls')),

    path('ckeditor/', include('ckeditor_uploader.urls')),

] + static(settings.MEDIA_URL,document_root=settings.MEDIA_ROOT)

blog_urls.py

from django.urls import path, re_path

from . import views



app_name = 'blog'



urlpatterns = [

    path('', views.PostListView.as_view(), name='post_list'),

    # path('about/', views.AboutView.as_view(), name='about'),

    path('post/<slug>', views.PostDetailView.as_view(), name='post_detail'),

    path('post/new/', views.CreatePostView.as_view(), name='post_new'),

    path('post/<int:pk>/edit/', views.PostUpdateView.as_view(), name='post_edit'),

    path('drafts/', views.DraftListView.as_view(), name='post_draft_list'),

    path('post/<int:pk>/remove/', views.PostDeleteView.as_view(), name='post_remove'),

    path('post/<int:pk>/publish/', views.post_publish, name='post_publish'),

    path('post/<int:pk>/comment/', views.add_comment_to_post, name='add_comment_to_post'),

    path('comment/<int:pk>/approve/', views.comment_approve, name='comment_approve'),

    path('comment/<int:pk>/remove/', views.comment_remove, name='comment_remove'),

]

Error page attached