diff --git a/server/common/constant.js b/server/common/constant.js
index 38d9e36..6fb892b 100644
--- a/server/common/constant.js
+++ b/server/common/constant.js
@@ -15,6 +15,8 @@ const ITEM_CHIP_TYPE = 13;
 
 const ITEM_MATERIAL_CHIP_SUBTYPE = 3;
 
+const ERRCODE_SIGN_ERROR = 2001;
+
 exports.EVENTDB_STATE_PENDING = EVENTDB_STATE_PENDING;
 exports.EVENTDB_STATE_HANDLED = EVENTDB_STATE_HANDLED;
 exports.GAMEDB_NAME = GAMEDB_NAME;
@@ -29,3 +31,5 @@ exports.ITEM_BLIND_BOX_TYPE = ITEM_BLIND_BOX_TYPE;
 exports.ITEM_CHIP_TYPE = ITEM_CHIP_TYPE;
 
 exports.ITEM_MATERIAL_CHIP_SUBTYPE = ITEM_MATERIAL_CHIP_SUBTYPE;
+
+exports.ERRCODE_SIGN_ERROR = ERRCODE_SIGN_ERROR;