Update dhcp_config_save.js

routes/dhcp_config_save.js

@@ -5,11 +5,13 @@
 var express = require('express');
 var router  = express.Router();
 
+
 var authorize = require('../core/authorize.js');
 
 router.post('/', authorize.auth, function(req, res, next) {
 	var request = req.body;
 
+	var fs = require('fs');
 	
 	fs.writeFileSync("./syntax_verify_config", request.dhcp_config_data, 'utf8');