Revise message explaining the cause of exception

Change-Id: Ic6c6048f3e04d99c55b8de08ec4be1370139a549
diff --git a/src/main/java/net/onrc/onos/core/newintent/IntentCompilationResult.java b/src/main/java/net/onrc/onos/core/newintent/IntentCompilationResult.java
index 34a5a74..54096be 100644
--- a/src/main/java/net/onrc/onos/core/newintent/IntentCompilationResult.java
+++ b/src/main/java/net/onrc/onos/core/newintent/IntentCompilationResult.java
@@ -24,7 +24,7 @@
         checkNotNull(result);
         checkArgument(result.size() > 0,
                 "result of intent compilation should be " +
-                "more than 1 installable intents or more, but %s", result.size());
+                "at least one installable intent, but %s", result.size());
 
         this.result = new ArrayList<>(checkNotNull(result));
     }