diff --git a/core/interfaces/Service.go b/core/interfaces/Service.go
index 0572ba3..e5aaa4c 100644
--- a/core/interfaces/Service.go
+++ b/core/interfaces/Service.go
@@ -72,7 +72,7 @@ func ExecServices(services []interface{}, method ServiceMethodType, orderedTypes
 		i := _services[indexI]
 		iv := reflect.ValueOf(i)
 		m := iv.MethodByName(method.String())
-		rvs := m.Call([]reflect.Value{iv})
+		rvs := m.Call([]reflect.Value{})
 		if nil != rvs && 1 == len(rvs) && nil != rvs[0].Interface() {
 			return rvs[0].Interface().(error)
 		}