diff --git a/senlin/common/exception.py b/senlin/common/exception.py
index d390b3b7d..34834a215 100644
--- a/senlin/common/exception.py
+++ b/senlin/common/exception.py
@@ -211,6 +211,10 @@ class ClusterExists(SenlinException):
     msg_fmt = _("The Cluster (%(cluster_name)s) already exists.")
 
 
+class ClusterValidationFailed(SenlinException):
+    msg_fmt = _("%(message)s")
+
+
 class PolicyNotFound(SenlinException):
     msg_fmt = _("The Policy (%(policy_name)s) could not be found.")