AuditTrail YII расширение

Я новичок в yii, и я устанавливаю расширение auditTrail.
Я сделал все необходимые изменения в моем файле конфигурации main.php, но каждый раз, когда он показывает ту же ошибку

'Alias "auditTrail.AuditTrailModule" is invalid. Make sure it points
to an existing PHP file and the file is readable.'

Пожалуйста, помогите мне. Спасибо заранее .. мой отредактированный файл здесь:

// uncomment the following to define a path alias
// Yii::setPathOfAlias('local','path/to/local-folder');

// This is the main Web application configuration. Any writable
// CWebApplication properties can be configured here.
return array(
'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
'name'=>'My Web Application',

// preloading 'log' component
'preload'=>array('log'),

// autoloading model and component classes
'import'=>array(
'application.models.*',
'application.components.*',
'application.modules.auditTrail.models.AuditTrail',


),

'modules'=>array(


'auditTrail'=>array(),
// uncomment the following to enable the Gii tool

'gii'=>array(
'class'=>'system.gii.GiiModule',
'password'=>false,
// If removed, Gii defaults to localhost only. Edit carefully to taste.
'ipFilters'=>array('127.0.0.1','::1'),
),

),

// application components
'components'=>array(
'user'=>array(
// enable cookie-based authentication
'allowAutoLogin'=>true,
),
// uncomment the following to enable URLs in path-format

'urlManager'=>array(
'urlFormat'=>'path',
'rules'=>array(
'<controller:\w+>/<id:\d+>'=>'<controller>/view',
'<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
'<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
),
),

'db'=>array(
'connectionString' => 'sqlite:'.dirname(__FILE__).'/../data/testdrive.db',
),
// uncomment the following to use a MySQL database

'db'=>array(
'connectionString' => 'mysql:host=localhost;dbname=assetdb',
'emulatePrepare' => true,
'username' => 'root',
'password' => 'Preksha#12',
'charset' => 'utf8',
),

'errorHandler'=>array(
// use 'site/error' action to display errors
'errorAction'=>'site/error',
),
'log'=>array(
'class'=>'CLogRouter',
'routes'=>array(
array(
'class'=>'CFileLogRoute',
'levels'=>'error, warning',
),
// uncomment the following to show log messages on web pages
/*
array(
'class'=>'CWebLogRoute',
),
*/
),
),
),

// application-level parameters that can be accessed
// using Yii::app()->params['paramName']
'params'=>array(
// this is used in contact page
'adminEmail'=>'[email protected]',
),
);

вот ошибка ::

CException

Alias "auditTrail.AuditTrailModule" is invalid. Make sure it points to an existing PHP file and the file is readable.