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1down votefavorite I'm new to Yii, and I'm getting this error "Class 'app\controllers\CActiveDataProvider' not found" while running a widget. This is my code: models/industrial.php: <?php namespace app\models; use yii\db\ActiveRecord; class Industrial extends ActiveRecord { } controllers/IndustrialController.php: <?php namespace app\controllers; use yii\web\Controller; use yii\data\Pagination; use app\models\industrial; class IndustrialController extends Controller { public function actionIndex() { $dataProvider=new CActiveDataProvider('Industrial', array( 'pagination'=>array( 'pageSize'=>20, ), )); $query = industrial::find(); $pagination = new Pagination([ 'defaultPageSize' => 20, 'totalCount' => $query->count(), ]); $industrials = $query->orderBy('Company_Name') ->offset($pagination->offset) ->limit($pagination->limit) ->all(); return $this->render('index', [ 'industrials' => $industrials, 'pagination' => $pagination, 'dataProvider'=>$dataProvider, ]); } } views/industrial/index.php: <?php use yii\helpers\Html; use yii\widgets\LinkPager; ?> <h1>Industrial Companies</h1> <ul> <?php use kartik\export\ExportMenu; use kartik\grid\GridView; $gridColumns = [ ['class' => 'yii\grid\SerialColumn'], 'id', 'name', [ 'attribute'=>'Name', 'label'=>'Name', 'vAlign'=>'middle', 'width'=>'190px', 'value'=>function ($model, $key, $index, $widget) { return Html::a($model->Name, '#', []); }, 'format'=>'raw' ], 'Name', 'Location', 'Telephone', ]; echo ExportMenu::widget([ 'dataProvider' => $dataProvider, 'columns' => $gridColumns, 'fontAwesome' => true, 'dropdownOptions' => [ 'label' => 'Export All', 'class' => 'btn btn-default' ] ]) . "<hr>\n". GridView::widget([ 'dataProvider' => $dataProvider, 'columns' => $gridColumns, 'export' => [ 'fontAwesome' => true, ] ]); $array = (array) $industrials; function build_table($array){ // start table $html = '<table class="altrowstable" id="alternatecolor">'; // header row $html .= '<tr>'; foreach($array[0] as $key=>$value){ $html .= '<th>' . $key . '</th>'; } $html .= '</tr>'; // data rows foreach( $array as $key=>$value){ $html .= '<tr>'; foreach($value as $key2=>$value2){ $html .= '<td>' . $value2 . '</td>'; } $html .= '</tr>'; } // finish table and return it $html .= '</table>'; return $html; } echo build_table($array); ?> <?= LinkPager::widget(['pagination' => $pagination]) ?> I'm getting this error in IndustrialController at $dataProvider=new CActiveDataProvider('Industrial', array( 'pagination'=>array( 'pageSize'=>20, ), )); What is the problem here? Could you please help me?