diff --git a/server/web3service/blockchain.js b/server/web3service/blockchain.js
index 5d6d998..1bb1112 100644
--- a/server/web3service/blockchain.js
+++ b/server/web3service/blockchain.js
@@ -5,6 +5,7 @@ const bcutils = require('j7/bcutils');
 const event = require('j7/event');
 const sync = require("j7/sync");
 const log = require("j7/log");
+const contract = require('common/contract');
 const metaFactory = require('./metadata/factory');
 
 class BlockChain {