Souke/frontend/views/site/error.php

<?php

use yii\helpers\Html;

/* @var $this yii\web\View */
/* @var $name string */
/* @var $message string */
/* @var $exception Exception */

$this->title = $name;
?>
<div class="site-error">

    <h1><?= Html::encode($this->title) ?></h1>

    <div class="alert alert-danger">
        <?= nl2br(Html::encode($message)) ?>
    </div>

    <p><?= Html::a("Retour à l'accueil", ['site/index']) ?></p>
    
</div>