Alias "bootstrap.widgets.TbHeroUnit" is invalid. Make sure it points to an existing PHP file and the

Yii+Yii-bootstrap 使用时会报上面的错，主要是在LINUX或MAC平台下面，WIN下面不存在该问题
问题的原因在行assets 的权限 问题。解决的办法就是进入 app/protected/extensions/bootstrap 目录下面然后修改权限即可。
cd protected/extensions/bootstrap
chmod -R 777 assets

其它： http://cniska.net/yii-bootstrap/index.html http://cniska.net/yii-bootstrap/setup.html
// Define a path alias for the Bootstrap extension as it's used internally.
// In this example we assume that you unzipped the extension under protected/extensions.
Yii::setPathOfAlias('bootstrap', dirname(__FILE__).'/../extensions/bootstrap'); 添加该行在config/main.php中

return array(
'theme'=>'bootstrap', // 启用该模板时需要将extensions/bootstrap/theme 复制至最外面的皮肤目录下面 requires you to copy the theme under your themes directory
'modules'=>array(
'gii'=>array(
'generatorPaths'=>array(
'bootstrap.gii',
),
),
),
'components'=>array(
'bootstrap'=>array(
'class'=>'bootstrap.components.Bootstrap',
),
),
);