diff --git a/models/shipcloud_pickup.py b/models/shipcloud_pickup.py
index 60746f4..11b654c 100644
--- a/models/shipcloud_pickup.py
+++ b/models/shipcloud_pickup.py
@@ -69,7 +69,7 @@ class SCPickup(models.Model):
         try:
             result = api.create_pickup(sc_pickup)
         except shipcloud.ApiError as err:
-            raise Warning(err)
+            raise Warning(str(err))
         _logger.info("shipcloud response: %s", result)
         self.sc_pickup_id = result['id']
         self.carrier_pickup_number = result['carrier_pickup_number']