diff --git a/xos/synchronizers/onos/steps/sync_onosapp.py b/xos/synchronizers/onos/steps/sync_onosapp.py
index add749d..666da21 100644
--- a/xos/synchronizers/onos/steps/sync_onosapp.py
+++ b/xos/synchronizers/onos/steps/sync_onosapp.py
@@ -87,7 +87,7 @@
     def get_cluster_configuration(self, o):
         instance = self.get_instance(o)
         if not instance:
-           raise "No instance for ONOS App"
+           raise Exception("No instance for ONOS App")
         node_ips = [socket.gethostbyname(instance.node.name)]
 
         ipPrefix = ".".join(node_ips[0].split(".")[:3]) + ".*"