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Reverse for 'forum_post' with no arguments not found. 1 pattern(s) tried: ['forumpost/(?P<pk>[0-9]+)/$'] How can I do to solve the problem?

I would like to link this function to the link in the base Templates, but I have this error, what solution could be found? Should I use the Reverse function?
my views
def forumPostList(request, pk):
conversation = get_object_or_404(Conversation, pk=pk)
form_response = PostModelForm()
posts_conversation = Post.objects.filter(conversation=conversation)
context = {"conversation": conversation,
"posts_conversation": posts_conversation,
"form_response": form_response
}
return render(request, "account/forum_post.html", context)
{% extends 'base.html' %}
{% block content %}
<h1>Received messages:</h1>
<hr>
<br>
{% for post in posts_conversation %}
<h3>{{ conversation.title }}</h3>
<p>Posts: {{ post.author_post.posts.count }}</p>
<p>Posts: {{ post.author_post.username }}</p>
{% endfor %}
{% endblock content %}
My base
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="{% url 'forum_post' %}">forum_post</a>
</li>

forumPostList view needs to get 'pk' as parameter in url. So for calling it with a link, your link should specify 'pk'.
So you can use url block like this:
{% url 'forum_post' conversation_pk %}
That coversation_pk should be specified somehow.

404 Page not found Django even though it is in urls.py

I don't know why I am getting a 404 error on the page flights/1 when clearly, I have a url pattern for
<int:flight_id> (flights is a app). Help!
My urls.py for the project
from django.contrib import admin
from django.urls import path
from django.urls import include
urlpatterns = [
path('admin/', admin.site.urls),
path('flights/', include('flights.urls'))
]
My urls.py for the flights app
from django.urls import path
from . import views
urlpatterns = [
path("", views.index, name="index"),
path("<int:flight_id>", views.flight, name="flight"),\
]
And the views.flight
def flight(request, flight_id):
flight = Flight.objects.get(id=flight_id)
return render(request, "flights/flight.html", {
"flight": flight,
"passengers": flight.passengers.all(),
"non_passengers": Passenger.objects.exclude(flights=flight).all()
})
Template
{% extends "flights/layout.html" %}
{% block body %}
<h1>Flight {{ flight.id }}</h1>
<ul>
<li>Origin: {{ flight.origin }}</li>
<li>Destination: {{ flight.destination }}</li>
<li>Duration: {{ flight.duration }}</li>
</ul>
<h2>Passengers</h2>
<ul>
{% for passenger in passengers %}
<li>{{ passenger }}</li>
{% empty %}
<li>No passengers.</li>
{% endfor%}
</ul>
<h2>Add Passenger</h2>
<form method="POST" action="{% url 'flight' flight.id book %}">
{% csrf_token %}
<select name="passengers">
{% for passenger in non_passengers %}
<option value="{{ passenger.id }}">{{ passenger }}</option>
{% endfor %}
</select>
</form>
Back to Flight List
{% endblock %}
With layout.html being html boilerplate code

NoReverseMatch: Unable to set named group in URL in Django

I am getting this error for going to the url : http://127.0.0.1:9000/mypolls/anyerror
NoReverseMatch at /mypolls/anyerror
Reverse for 'mypolls' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['mypolls/(?P<error_message>.*)$']
My urls.py contains:
from django.conf.urls import url
from . import views
urlpatterns=[
url(r'^$',views.home,name='home'),
url(r'^polls/$',views.list,name='list'),
url(r'^polls/(?P<pk>[0-9]+)$',views.detail,name='detail'),
url(r'^polls/(?P<pk>[0-9]+)/vote$',views.vote,name='vote'),
url(r'^mypolls/(?P<error_message>.*)$',views.mypolls,name='mypolls'),
url(r'^create/$',views.create,name='create'),
url(r'^polls/(?P<pk>[0-9]+)/edit$',views.edit,name='edit'),
url(r'^polls/(?P<pk>[0-9]+)/delete$',views.delete,name='delete'),
]
My views.py contains:
def mypolls(request,error_message=None):
polls=Poll.objects.filter(author=request.user)
return render(request,'polls/list.html',{'polls':polls,'error_message':error_message})
What is wrong here?
My list.html contains:
{% extends 'polls/base.html' %}
{% block content %}
{% if error_message %}
<p>{{error_message}}</p>
{% endif %}
{% for poll in polls %}
<li><a href='{% url "detail" pk=poll.pk %}'>{{ poll.question }}</a>
{% endfor %}
{% endblock %}

The problem was in base.html. I did not give the keyword argument in url for mypolls in base.html. Now I have set the url as:
{% url "mypolls" error_message="" %}
and it is working fine.
Thanks #Alasdair and everyone.

Syntax error in urls.py

I was trying to add an editing/deleting function for a bookmarks app.
I get the following error:
My Urls.py file is the following:
from django.conf.urls import patterns, include, url
# Uncomment the next two lines to enable the admin:
# from django.contrib import admin
# admin.autodiscover()
urlpatterns = patterns('',
# Examples:
# url(r'^$', 'myproject.views.home', name='home'),
# url(r'^myproject/', include('myproject.foo.urls')),
# Uncomment the admin/doc line below to enable admin documentation:
# url(r'^admin/doc/', include('django.contrib.admindocs.urls')),
# Uncomment the next line to enable the admin:
# url(r'^admin/', include(admin.site.urls)),
url(r'^$', 'bookmarks.views.index', name='home'),
url(r'^bookmarks/$', 'bookmarks.views.index', name='bookmarks_view'),
url(r'^tags/([\w-]+)/$', 'bookmarks.views.tag'),
url(r'^login/$', 'django.contrib.auth.views.login'),
url(r'^logout/$', 'django.contrib.auth.views.logout', {'next_page': '/'})
url(r'^delete/(\d+)/$', 'bookmarks.views.delete'),
url(r'^edit/(\d+)/$', 'bookmarks.views.edit'),
)
The views.py file:
...remaining code
def delete(request, bookmark_id):
if request.method == 'POST':
b = get_object_or_404(Bookmark, pk=int(bookmark_id))
b.delete()
return redirect(index)
def edit(request, bookmark_id):
b = get_object_or_404(Bookmark, pk=int(bookmark_id))
context = {
'form' : BookmarkForm(instance=b),
}
return render(request, 'edit.html', context)
The bookmark widget in index.html
{% block bookmark_widget %}
{% if request.user %}
<div id="new-bookmark-widget">
<form method="post" action="{% url bookmarks.views.index %}">
{% csrf_token %}
<h3>Bookmark</h3>
{{ form.as_p }}
<p><button id="new-bookmark-submit">Submit</button>Submit</button>
</form>
</div>
{% endif %}
{% endblock %}
The relevant div in base.html
<div id="container">
<div id="header">
{% block bookmark_widget %}
{% endblock %}
<div id="authentication">
{% if user.is_authenticated %}
Hi {{user}}! Logout
{% else %}
Login
{% endif %}
</div>
<h1>My bookmarking app</h1>
</div>
<div id="content">
<h2>{% block subheader %}{% endblock %}</h2>
{% block content %}
Sample content -- you should never see this, unless an inheriting template fails to have any content block!
{% endblock %}
</div>
<div id="footer">
All copyrights reserved
</div>
</div>
The complete bookmark.html file:
<li>
<a class="bookmark-link" href="{{ bookmark.url }}">{% if bookmark.title %}{{ bookmark.title }}{% else %}{{ bookmark.url }}{% endif %}</a>
<div class="metadata"><span class="author">Posted by {{ bookmark.author }}</span> | <span class="timestamp">{{ bookmark.timestamp|date:"Y-m-d" }}</span>
{% if bookmark.tag_set.all %}| <span class="tags">
{% for tag in bookmark.tag_set.all %}
{{ tag.slug }}</span>
{% endfor %}
{% endif %}
</div>
{% if request.user.is_authenticated %}
<div class="actions"><form method=="POST" action="{% url bookmarks.view.delete bookmark.id %}>
{% csrf_token %}
<input type="submit" value="Delete">
</form> </div>
{% endif %}
I am new to Django, how do I handle error mistakes and how do I find the problem? I couldnt see it from the error message.
Thank you!

missing a comma on the following line:
url(r'^logout/$', 'django.contrib.auth.views.logout', {'next_page': '/'}), <-add here
I presume your comments section also lines up with the rest of your code and it is formatted incorrectly in your question

You're missing a comma at the end of this line:
url(r'^logout/$', 'django.contrib.auth.views.logout', {'next_page': '/'})

Link a view to a link Django

I am making a simple blog app in Django as a learning exercise. I am able to add posts, see them all on the front page, so it is working so far. Where I am having an issue is creating a view that shows the whole post on a separate page. I want to click the title, and go to a page at the url /post/primary key that has the title and body. When I click on the link, I get a page with just the base.html. Not sure where I am missing anything, here are urls.py, views.py, and post.html:
urls.py
from django.conf.urls import patterns, include, url
# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()
urlpatterns = patterns('blog.views',
url(r'^$', 'frontpage'),
url(r'^post/(\d+)/$', 'post'),
)
urlpatterns += patterns('',
url(r'^admin/', include(admin.site.urls)),
)
from django.core.paginator import Paginator, InvalidPage, EmptyPage
from django.core.urlresolvers import reverse
from django.shortcuts import get_object_or_404, render_to_response
from blog.models import *
views.py
def frontpage(request):
posts = Post.objects.all().order_by("-created")
paginator = Paginator(posts, 5)
page = request.GET.get('page', '1')
try:
posts = paginator.page(page)
except (InvalidPage, EmptyPage):
posts = paginator.page(paginator.num_pages)
return render_to_response("list.html", dict(posts=posts, user=request.user))
def post(request, pk):
"""Single Post"""
post = Post.objects.get(pk = pk)
d = dict(post=post, user=request.user)
return render_to_response("post.html", d)
post.html
{% extends "base.html" %}
{% block content %}
<div class ="main">
<ul>
{% for post in posts.object_list %}
<div class = "title">{{ post.title }}</div>
<ul>
<div class="time"> {{ post.created }}</div>
<div class ="body"> {{ post.body|linebreaks }}</div>
</ul>
{% endfor %}
</ul>
</div>
{% endblock %}
Thanks in advance for your help.

I am assuming the page.html is actually the post.html you have in yoru codes sample???You no longer have a collection of posts but instead just have 1 post
This needs to change from: (which is looping through your posts)
{% extends "base.html" %}
{% block content %}
<div class ="main">
<ul>
{% for post in posts.object_list %}
<div class = "title">{{ post.title }}</div>
<ul>
<div class="time"> {{ post.created }}</div>
<div class ="body"> {{ post.body|linebreaks }}</div>
</ul>
{% endfor %}
</ul>
</div>
{% endblock %}
To something like (which just displays your single post):
{% extends "base.html" %}
{% block content %}
<div class ="main">
{{ post.title }}
{{ post.created }}
{{ post.body }}
</div>
{% endblock %}

You have to change urls.py to go to a page at the url /post/primary key.
urlpatterns = patterns('blog.views',
url(r'^$', 'frontpage'),
url(r'^post/(?P<pk>\d+)/$', 'post'),
)