sqlserver 拖拽模式下 preview应用的时候报错You cannot serialize or unserialize PDO instances 错误

[skywalkerhw]

错误堆栈：
Message: You cannot serialize or unserialize PDO instances

Backtrace:

File: C:\xampp\htdocs\dbface2\application\core\MY_Controller.php
Line: 2601
Function: save

File: C:\xampp\htdocs\dbface2\application\controllers\App.php
Line: 973
Function: cached_db_get

File: C:\xampp\htdocs\dbface2\application\controllers\App.php
Line: 461
Function: _preview_advrep_tabular

File: C:\xampp\htdocs\dbface2\application\controllers\App.php
Line: 304
Function: _execute_list_app

File: C:\xampp\htdocs\dbface2\index.php
Line: 312
Function: require_once