use rest_framework's permission denied
diff --git a/planetstack/core/xoslib/methods/sliceplus.py b/planetstack/core/xoslib/methods/sliceplus.py
index c71b57d..819ee92 100644
--- a/planetstack/core/xoslib/methods/sliceplus.py
+++ b/planetstack/core/xoslib/methods/sliceplus.py
@@ -7,7 +7,7 @@
from django.forms import widgets
from core.xoslib.objects.sliceplus import SlicePlus
from plus import PlusSerializerMixin, PlusRetrieveUpdateDestroyAPIView, PlusListCreateAPIView
-from django.core.exceptions import PermissionDenied
+from rest_framework.exceptions import PermissionDenied
if hasattr(serializers, "ReadOnlyField"):
# rest_framework 3.x