Module wise Error Page in Yii2

module.php

Yii::$app->errorHandler->errorAction = 'studconsult/default/error';

<?php

namespace app\modules\admin;

class Module extends \yii\base\Module
{
    public $controllerNamespace = 'app\modules\admin\controllers';

    public function init()
    {
        parent::init();

        Yii::$app->errorHandler->errorAction = 'admin/default/error';  // add this line 


      }
}

Need to add use Yii; after namespace.