hi..
when i use this code for install extension in yii application this time i have one CExeptions is generate like :

Alias "demoapp.protected.extensions.slider.slider" is invalid. Make sure it points to an existing directory or file.



this code is:


$this->widget('demoapp.protected.extensions.slider.slider', array(
'container'=>'slideshow',
'width'=>960,
'height'=>240,
'timeout'=>6000,
'infos'=>true,
'constrainImage'=>true,
'images'=>array('01.jpg','02.jpg','03.jpg','04.jpg'),
'alts'=>array('First description','Second description','Third description','Four description'),
'defaultUrl'=>Yii::app()->request->hostInfo
)
);

please give me solution for that as soon as fast.


thank u....

after this it also show me Cexception in Yiibase.php like this:

throw new CException(Yii::t('yii','Alias "{alias}" is invalid. Make sure it points to an existing directory or file.',