diff --git a/core/interfaces/Service.go b/core/interfaces/Service.go
index 073e658..da218eb 100644
--- a/core/interfaces/Service.go
+++ b/core/interfaces/Service.go
@@ -8,8 +8,8 @@ import (
 type Service interface {
 	InitService() error
 	StartService() error
-	StopService() error
-	DestroyService() error
+	StopService()
+	DestroyService()
 }
 
 type ServiceMethodType int
@@ -73,8 +73,13 @@ func ExecServices(services []interface{}, method ServiceMethodType, orderedTypes
 		iv := reflect.ValueOf(i)
 		m := iv.MethodByName(method.String())
 		rvs := m.Call([]reflect.Value{})
-		if nil != rvs && 1 == len(rvs) && nil != rvs[0].Interface() {
-			return rvs[0].Interface().(error)
+
+		switch method {
+		case ServiceMethodInit, ServiceMethodStart:
+			if nil != rvs && 1 == len(rvs) && nil != rvs[0].Interface() {
+				return rvs[0].Interface().(error)
+			}
+		default:
 		}
 	}