public function actionIndex()
{

    $searchModel = new EquipoSearch();
    $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
            return $this->render('index', [
        'searchModel' => $searchModel,
        'dataProvider' => $dataProvider,
    ]);
}

<?php

use yiihelpersHtml;
use yiigridGridView;

/* @var $this yiiwebView */
/* @var $searchModel appmodelsEquipoSearch */
/* @var $dataProvider yiidataActiveDataProvider */

 $this->title = 'Inventario'; //Esta es la linea 10
 $this->params['breadcrumbs'][] = $this->title;
 ?>