NoReverseMatch at /accounts/accounts/auth/

from django.contrib.auth.decorators import login_required
from django.shortcuts import render, redirect, get_object_or_404
from django.utils import timezone

from models import Post
from .forms import PostForm


@login_required
def message(request):
posts = Post.objects.order_by('-created_date')
return render(request, 'post_list.html', {'xyz': posts})


@login_required
def post_new(request):
if request.method == "POST":
form = PostForm(request.POST)
if form.is_valid():
post = form.save(commit=False)
post.author = request.user
post.published_date = timezone.now()
post.save()
return redirect('message_board:list')
else:
form = PostForm()
return render(request, 'post_edit.html', {'form': form})


def post_detail(request, pk=None):
print request, pk
post = get_object_or_404(Post, pk=pk)
return render(request, 'post_detail.html', {'post': post})

I tried my best to solve this but i couldn't please help me 

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