Yii框架中出现未知错误

我的Yii音乐商店应用程序中有这段代码，但我不知道错误。我的想法是显示/浏览专辑、艺术家和流派的类别/标准。但它总是显示"其他条件"。我已尝试修复它，但找不到错误。代码如下。希望任何人都能修复它。谢谢所有

<?php
class StoreController extends Controller
{
public $message;
public function actionIndex()
{
    $this->message = "Hello from Store.Index()";
    $this->render('index', array('content'=>$this->message));
}
public function actionBrowse()
{
    if(isset($_GET["gid"])){
        $gid = $_GET["gid"];
        $genreCriteria = new CDbCriteria();
        $genreCriteria->select = "`GenreId`, `Name`, `Description`";
        $genreCriteria->condition = "genreId = " . $_GET["gid"];
        $artistCriteria = new CDbCriteria();
        $artistCriteria->alias = "t1";
        $artistCriteria->select = "DISTINCT `t1`.`Name`, `t1`.`ArtistId`";
        $artistCriteria->join = "LEFT JOIN `tbl_album` ON `tbl_album`.`ArtistId` = `t1` . `ArtistId`";
        $artistCriteria->order = "`t1`.`ArtistId` ASC";
        $albumCriteria = new CDbCriteria();
        $albumCriteria->alias = "t2";
        $albumCriteria->select = "`AlbumId`, `GenreId`, `Title`, `Price`, `AlbumArtUrl`";
        $albumCriteria->condition = "`GenreId` = " . $_GET["gid"];
        $albumCriteria->order = "`ArtistId` ASC";
        $this->render('index', array('Albums' => Album::model()->findAll($albumCriteria),
                                     'Artist' => Artist::model()->findAll($artistCriteria),
                                     'Genre' => Genre::model()->findAll($artistCriteria)));
    }else{
        $this->message = "Hello from Store.Browse()";
        $this->render('index', array('content'=>$this->message));
    }
}
public function actionDetails()
{
    $this->message = "Hello from Store.Details()";
    $this->render('index', array('content'=>$this->message));
}
// Uncomment the following methods and override them if needed
/*
public function filters()
{
    // return the filter configuration for this controller, e.g.:
    return array(
        'inlineFilterName',
        array(
            'class'=>'path.to.FilterClass',
            'propertyName'=>'propertyValue',
        ),
    );
}
public function actions()
{
    // return external action classes, e.g.:
    return array(
        'action1'=>'path.to.ActionClass',
        'action2'=>array(
            'class'=>'path.to.AnotherActionClass',
            'propertyName'=>'propertyValue',
        ),
    );
}
*/
}