python - I am getting this error "didn't return an HttpResponse object. It returned None instead" -

i'm trying have tags return tags detail page getting following error message

i getting error "didn't return httpresponse object. returned none instead" 

i tried copy , modify "post" class suit "tags" needs it's not working heres code

models.py:

class tag(models.model):     title = models.charfield(max_length=250)     slug = models.slugfield(max_length=200, unique=true)     timestamp = models.datetimefield(auto_now=false, auto_now_add=true)     updated = models.datetimefield(auto_now=true, auto_now_add=false)      def __str__(self):         return self.title      def get_absolute_url(self):         return reverse("posts:tag_index", kwargs={"slug": self.slug})      class meta:         ordering = ["-timestamp"] 

my posts/urls.py:

from django.conf.urls import url  .views import post_list, post_create, post_detail, post_update, post_delete, sewp, tagindex   urlpatterns = [     url(r'^$',   post_list, name='list'),     url(r'^tag/(?p<slug>[\w-]+)/$', tagindex, name="tag_index"),     url(r'^create/$', post_create, name='create'),     url(r'^sewp$', sewp, name='sewp'),     url(r'^(?p<slug>[\w-]+)/$', post_detail, name='detail'),     url(r'^(?p<slug>[\w-]+)/edit/$', post_update, name='update'),     url(r'^(?p<id>\d+)/delete/$', post_delete, name='delete'), ] 

my views.py:

def tagindex(request, slug=none):     instance = get_object_or_404(tag, slug=slug)     context = {         "instance": instance     }     render(request, "posts/tags.html", context) 

my tags.html:

{% extends 'posts/base.html' %}  {% block content %}     {{ instance }}  {% endblock content %} 

i saw video on youtube the guy did

def detail(request):    message = "hello"    return httpresponse(message) 

but doesn't suit needs. how can make when click link posts same link shown on tags.html page?

you should return render

return render(request, "posts/tags.html", context)

render shortcut rendering template context , returning httpresponse