YII2在视图中怎么使用链接？[2.0]

在YII1.1中可以使用

<a href="<?php echo $this->createUrl('site/index') ?>">前台首页</a>

那在2中使用报错

Error
An internal server error occurred.
The above error occurred while the Web server was processing your request.

Please contact us if you think this is a server error. Thank you.

刚接触2

2中
或者