diff --git a/README.md b/README.md
index 9bdc144..cad087e 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@
 
 This application requires Python3 to be installed with all the packages listed in `requirements.txt`, as well as the following software:
 
-* Perl and the erect2cubic package
+* Perl and the erect2cubic package (Panotools::Script)
 * Hugin (incl. Nona)
 * Java and zxing
-* PythonMagick
\ No newline at end of file
+* PythonMagick
+* zbar
\ No newline at end of file
diff --git a/core/views/__init__.py b/core/views/__init__.py
index 502a317..57ed959 100644
--- a/core/views/__init__.py
+++ b/core/views/__init__.py
@@ -53,14 +53,14 @@ class APICreateSeries(JsonView):
         if id:
             try:
                 Series.objects.get(id=id)
-                raise ValueError("Series object with id %s exists" % id)
+                return JsonResponse({"error": "Series object with id %s exists" % id})
             except Series.DoesNotExist:
                 pass
 
         if uuid:
             try:
                 Series.objects.get(id=uuid)
-                raise ValueError("Series object with uuid %s exists" % uuid)
+                return JsonResponse({"error": "Series object with uuid %s exists" % uuid})
             except Series.DoesNotExist:
                 pass