Returned a template response with no `template_name` attribute set on either the view or response

[ejfilip]

Hi, I setup everything as per the docs but I'm getting this error and I can't find whats causing it. I went through the docs and there is nothing I can use from there. There was an issue on drf-yasg (https://github.com/axnsan12/drf-yasg/issues/532) that was closed by the person who opened it with no solution given.

• drf-yasg2==1.18.5
• djangorestframework==3.8.0
• Django==2.0.1

Internal Server Error: /swagger/
Traceback (most recent call last):
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\exception.py", line 35, in inner
    response = get_response(request)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py", line 158, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py", line 156, in _get_response
    response = response.render()
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\django\template\response.py", line 106, in render
    self.content = self.rendered_content
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\rest_framework\response.py", line 72, in rendered_content
    ret = renderer.render(self.data, accepted_media_type, context)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\drf_yasg2\renderers.py", line 79, in render
    swagger, accepted_media_type, renderer_context
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\rest_framework\renderers.py", line 168, in render
    template_names = self.get_template_names(response, view)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\lib\site-packages\rest_framework\renderers.py", line 197, in get_template_names
    'Returned a template response with no `template_name` attribute set on either the view or response'
django.core.exceptions.ImproperlyConfigured: Returned a template response with no `template_name` attribute set on either the view or response
[16/Oct/2020 00:39:23] "GET /swagger/ HTTP/1.1" 500 112354

urls.py

from rest_framework import permissions
from drf_yasg2.views import get_schema_view
from drf_yasg2 import openapi

schema_view = get_schema_view(
   openapi.Info(
      title="Snippets API",
      default_version='v1',
      description="Test description",
   ),
   public=True,
   permission_classes=(permissions.AllowAny,),
)

urlpatterns = [
    
    url(r'^swagger(?P<format>\.json|\.yaml)$', schema_view.without_ui(cache_timeout=0), name='schema-json'),
    url(r'^swagger/$', schema_view.with_ui('swagger', cache_timeout=0), name='schema-swagger-ui'),
    path('redoc/', schema_view.with_ui('redoc', cache_timeout=0), name='schema-redoc'),

settings.py

INSTALLED_APPS = [
    'rest_framework',
    'myappname',
    'rest_framework.authtoken',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'fcm_django',
    'storages',
    'colorfield',
    'drf_yasg2',
]

[JoelLefkowitz]

I cannot recreate this issue. Can you verify your installation is 1.18.5+?