Myujth

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