Google sync throwing error to login

pkg/vtiger/modules/Google/modules/Google/connectors/Config.php

 <?php
-
-/* 
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
+/* +**********************************************************************************
+ * The contents of this file are subject to the vtiger CRM Public License Version 1.1
+ * ("License"); You may not use this file except in compliance with the License
+ * The Original Code is: vtiger CRM Open Source
+ * The Initial Developer of the Original Code is vtiger.
+ * Portions created by vtiger are Copyright (C) vtiger.
+ * All Rights Reserved.
+ * ***********************************************************************************/
 
 Class Google_Config_Connector {
-    static $clientId = '';
-    static $clientSecret = '';
+	static $clientId = '';
+	static $clientSecret = '';
+	static $redirectUrl = '';
 }

pkg/vtiger/modules/Google/modules/Google/connectors/Oauth2.php

@@ -54,14 +54,14 @@ class Google_Oauth2_Connector {
     const OAUTH2_REVOKE_URI = 'https://accounts.google.com/o/oauth2/revoke';
     
     public function __construct($module,$userId=false) {
-        global $site_URL;
-        $this->source_module = $module;
-        if($userId) $this->user_id = $userId;
-        $this->service_name = $this->service_provider . $module;
-        $this->client_id = Google_Config_Connector::$clientId;
-        $this->client_secret = Google_Config_Connector::$clientSecret;
-        $this->redirect_uri = rtrim($site_URL, '/').'/index.php?module=Google&view=List&operation=sync&sourcemodule='.$this->source_module.'&service='.$this->service_name;
-        $this->scope = $this->scopes[$this->source_module];
+		global $site_URL;
+		$this->source_module = $module;
+		if($userId) $this->user_id = $userId;
+		$this->service_name = $this->service_provider . $module;
+		$this->client_id = Google_Config_Connector::$clientId;
+		$this->client_secret = Google_Config_Connector::$clientSecret;
+		$this->redirect_uri = Google_Config_Connector::$redirectUrl;
+		$this->scope = $this->scopes[$this->source_module];
     }
     
     public function getClientId() {