Doesn't see the view from another app?

Question

JavaScript

There are 2 applications. In the template of one of them, you need to make a link to the view from the other.

<a class="navbar-brand" href="{% url 'posts:listofposts' %}">Home</a>

Posts.urls

from views import (
  listofposts, )
urlpatterns = [
url(r'^$',
    listofposts ,
    name='listofposts'),
]

I receive

Exception Value: 	

u'posts' is not a registered namespace

Answer 1

specify a variable in urls:
app_name = #name