* adjust the error info.

www/upgrade.php

@@ -9,10 +9,11 @@
  * @version     $Id$
  * @link        http://www.zentao.net
  */
+/* Judge my.php exists or not. */
 $myConfig = dirname(dirname(__FILE__)) . '/config/my.php';
 if(!file_exists($myConfig))
 {
-    echo "文件" . $myConfig . "不存在！ 提示：不要重命名zentao再覆盖！" . "<br />";
+    echo "文件" . $myConfig . "不存在！ 提示：不要重命名原来的禅道安装目录，下载最新的源码包，覆盖即可。" . "<br />";
     echo $myConfig . " doesn't exists! Please don't rename zentao before overriding the source code!";
     exit;
 }