求助，使用migrate类迁移数据库提示Message: Undefined property: Migrate::$auth
CI version 3.0.3新搭一台服务器环境，web程序部署完成，准备迁移数据库，按照官方教程在控制器文件夹添加一个迁移控制器，代码如下：
<?php
class Migrate extends CI_Controller
{
public function index()
{
$this->load->library('migration');
if ($this->migration->current() === FALSE)
{
show_error($this->migration->error_string());
}
}
}
输入url:http://localhost/migrate/，页面提示错误：
======================>up
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Migrate::$auth
Filename: libraries/Migration.php
Line Number: 443
An uncaught Exception was encountered
Type: Error
Message: Call to a member function table_exists() on null
Filename: /home/xzt/lianchong/Web/MonitorPHP/apps/libraries/Base_Migration.php
Line Number: 92
查看了下系统文件夹下的代码 libraries/Migration.php，类定义中找不到auth这个定义，请教下这个auth属性是哪里定义的？谢谢 你这报错是自定义了 Base_Migration.php 里面的错误，不是用的系统 Migration.php
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