diff --git a/.gitignore b/.gitignore
index 451dd79..edbd07d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,8 @@
 *.swp
 profile
 *.moved-aside
+.idea
+xos.iml
 xos/configurations/frontend/Dockerfile
 xos/core/xoslib/karma-*
 xos/core/xoslib/docs
diff --git a/xos/core/tests.py b/xos/core/tests.py
index 3c123d4..3eae077 100644
--- a/xos/core/tests.py
+++ b/xos/core/tests.py
@@ -139,7 +139,7 @@
         response = self.client.post('/xos/slices/?no_hyperlinks=1', data, format='json')
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
 
-    def xtest_validation_slice_name(self):
+    def test_validation_slice_name(self):
         """
         The slice name should start with site.login_base
         curl -H "Accept: application/json; indent=4" -u padmin@vicci.org:letmein 'http://xos:9999/xos/slices/?no_hyperlinks=1' -H "Content-Type: application/json" -X POST --data '{"name": "test", "site":"1", "serviceClass":1}'
@@ -150,8 +150,9 @@
             'serviceClass': self.serviceClass.id
         }
         response = self.client.post('/xos/slices/?no_hyperlinks=1', data, format='json')
-        self.assertRaise('slice name must begin with test_')
+        parsed = json.loads(response.content)
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertEqual(parsed['detail']['specific_error'], "slice name must begin with test_")
 
     def test_only_admin_can_change_creator(self):
         """
@@ -164,9 +165,19 @@
             creator=self.user
         )
 
+        user2 = User(
+            username='another_testuser',
+            email='another_test@mail.org',
+            password='testing',
+            site=self.site
+        )
+        user2.save()
+
         data = model_to_dict(slice)
         print(data)
-        data['creator'] = 2
+        data['creator'] = user2.id
 
         response = self.client.put('/xos/slices/%s/?no_hyperlinks=1' % slice.id, data, format='json')
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        parsed = json.loads(response.content)
+        self.assertEqual(parsed['detail']['specific_error'], "Insufficient privileges to change slice creator")
diff --git a/xos/xos/apibase.py b/xos/xos/apibase.py
index 03493ee..b39e8bb 100644
--- a/xos/xos/apibase.py
+++ b/xos/xos/apibase.py
@@ -105,6 +105,10 @@
             response=Response({'detail': {"error": "PermissionDenied", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_403_FORBIDDEN)
             response.exception=True
             return response
+        elif isinstance(exc, DjangoValidationError):
+            response=Response({'detail': {"error": "ValidationError", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_403_FORBIDDEN)
+            response.exception=True
+            return response
         else:
             return super(XOSListCreateAPIView, self).handle_exception(exc)