YII设置别名 'Unable to resolve the request "site/error".'

'yii\base\InvalidRouteException'
with message 'Unable to resolve the request "site/error".'

引用：http://www.linuxidc.com/Linux/2015-02/114116.htm
Yii2高级版本复制新项目会遇到下面的报错信息：
exception 'yii\base\InvalidRouteException' with message 'Unable to resolve the request "site/error".' in /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/base/Module.php:461

Stack trace:

#0 /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/web/ErrorHandler.php(80): yii\base\Module->runAction('site/error')

#1 /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/base/ErrorHandler.php(95): yii\web\ErrorHandler->renderException(Object(yii\web\NotFoundHttpException))

#2 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\NotFoundHttpException))

#3 {main}

Previous exception:

exception 'yii\base\InvalidRouteException' with message 'Unable to resolve the request "site/index".' in /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/base/Module.php:461

Stack trace:

#0 /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/web/Application.php(83): yii\base\Module->runAction('site/index', Array)

#1 /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/base/Application.php(375): yii\web\Application->handleRequest(Object(yii\web\Request))

#2 /Users/yuzhiyuan/Documents/htdocs/yii-application/mobile/web/index.php(18): yii\base\Application->run()

#3 {main}

Next exception 'yii\web\NotFoundHttpException' with message 'Page not found.' in /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/web/Application.php:95

Stack trace:

#0 /Users/yuzhiyuan/Documents/htdocs/yii-application/vendor/yiisoft/yii2/base/Application.php(375): yii\web\Application->handleRequest(Object(yii\web\Request))

#1 /Users/yuzhiyuan/Documents/htdocs/yii-application/mobile/web/index.php(18): yii\base\Application->run()

#2 {main}
解决办法：
找到common\config\bootstrap.php
找到上面的文件，添加一个新的别名：

Yii::setAlias('应用名', dirname(dirname(__DIR__)) . '/目录名’);

比如：Yii::setAlias('mobile', dirname(dirname(__DIR__)) . '/mobile’);
这样就正常显示了，妈的，让我调整了一个下午。
Yii 用户登陆机制  http://www.linuxidc.com/Linux/2015-01/111602.htm
Yii中引入js和css文件  http://www.linuxidc.com/Linux/2015-01/111603.htm
Yii 不完全解决方案  http://www.linuxidc.com/Linux/2015-01/111606.htm
Yii CGridView 基本使用 http://www.linuxidc.com/Linux/2015-01/111607.htm
Yii框架分布式缓存的实现方案 http://www.linuxidc.com/Linux/2015-02/113828.htm