Django: NoReverseMatch at / 'myapp' is not a registered namespace

Question

I have this error during template rendering. What i'm trying to do is allow the user to upload a csv then process the data into models.

error at line 109 'myapp' is not a registered namespace

This is my line 109 code

<form action="{% url "myapp:upload_csv" %}" method="POST" enctype="multipart/form-data" class="form-horizontal"> 

urls.py in mysite

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'', include('anomaly.urls')),
]

urls.py in anomaly

urlpatterns = [
    url(r'^$', views.post_list, name='post_list'),
    url(r'^upload/csv/$', views.upload_csv, name='upload_csv'),
]

Answer 1

try this
urls.py in mysite

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^', include('anomaly.urls',namespace='anomaly'))

To qualify a url name with a namespace use the syntax 'namespace:name'

<form action="{% url 'anomaly:upload_csv' %}" method="POST" enctype="multipart/form-data" class="form-horizontal"> 

Answer 2

It seems that you have switched to Django 2.0 This is one of the change the new version of Django contains.
Go to urls.py of your app anomaly and add the app_name = "anomaly". So your urls.py file will be like

    app_name = "anomaly"

    urlpatterns = [
    url(r'^$', views.post_list, name='post_list'),
    url(r'^upload/csv/$', views.upload_csv, name='upload_csv'),
]