Thinkphp3.1.3CannotredeclareT()解决方法

Thinkphp 3.1.3 Cannot redeclare T()
Cannot redeclare T() (previously declared in D:\xampp\htdocs\ThinkPhp\Common\common.php:25)
错误位置

FILE: D:\xampp\htdocs\ThinkPhp\Common\common.php 　LINE: 56

ThinkPHP3.1.3 { Fast & Simple OOP PHP Framework } -- [ WE CAN DO IT JUST THINK ]

刚下载的包，导入项目运行报这个错，应该如何解决

------解决思路----------------------
http://www.thinkphp.cn/topic/3047.html