diff --git a/models/NTUNHS/checkSignOffLessTake.js b/models/NTUNHS/checkSignOffLessTake.js
index f90feb5..8ec128b 100644
--- a/models/NTUNHS/checkSignOffLessTake.js
+++ b/models/NTUNHS/checkSignOffLessTake.js
@@ -5,6 +5,7 @@ const getPort = require('get-port');
 let config = require('./config');
 const fs = require('fs');
 const cheerio = require('cheerio');
+const schedule = require('node-schedule');
 
 async function main () {
     let opt = new chrome.Options();