diff --git a/webapp/controller/OutAppNftController.class.php b/webapp/controller/OutAppNftController.class.php
index 29756913..a031edf0 100644
--- a/webapp/controller/OutAppNftController.class.php
+++ b/webapp/controller/OutAppNftController.class.php
@@ -5,6 +5,7 @@ require_once('models/User.php');
 require_once('models/Hero.php');
 require_once('mt/NftDesc.php');
 require_once('mt/Hero.php');
+require_once('mt/EconomyAttribute.php');
 
 use models\Nft;
 use models\User;