how to make widget in Yii

I want to create a widget, here is the steps I made:

created folder widgets in folder protected .

created folder views in folder widgets .

added this in config/main.php : 'application.widgets.*'

this is the code of widgets/Alert.php :

class AlertWidget extends CWidget
{
    public $alert = null;

    private $_data = null;

    public function init()
    {
        $s = Yii::app()->session['userId'];
        $r = Requests::model()->findAll('idUser='.$s.' and confirm =0 and unconfirm=0 and cancel=0');
        $i=0;
        foreach($r as $x)
            $i++;
            if($i<=0)
                $alert=null;
            else
                $alert="(".$i.")";
        $this->_data = new CActiveDataProvider($alert);
    }

    public function run()
    {
        $this->render('alert', ['data' => $this->_data]);
    }
}

this is the code of widgets/views/alert.php :

echo $data;

this is the code to how I use the widget in a view:

$this->widget('application.widgets.Alert');

finally I got these errors:

( ! ) SCREAM: Error suppression ignored for
( ! ) Fatal error: Cannot redeclare class AlertWidget in C:wampwwwmediastoreprotectedwidgetsAlert.php on line 27

---

if you're going to access the widget using $this->widget('application.widgets.Alert'); then, the widget class name should be Alert (like: public class Alert extends CWidget... ) and the filename should remain Alert.php

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