Yii2- Undefined variable: modelsTraiffSlabs

I am working on Yii2. I am creating a dynamic form using wbraganca / yii2-dynamicform. I have followed these steps and tried to create it.

Controller

 public function actionCreate()
{
    $model = new MdcTariff();
    $modelsTraiffSlabs = [new MdcTariffSlabs()];
    if ($model->load(Yii::$app->request->post()) && $model->save()) {
        return $this->redirect(['view', 'id' => $model->id]);
    }

    return $this->render('create', [
        'model' => $model,
        'modelsTariffSlabs' => (empty($modelsTraiffSlabs)) ? [new MdcTariffSlabs()] : $modelsTraiffSlabs
    ]);
}

Create View

/* @var $this yii\web\View */
/* @var $model MdcTariff */
/* @var $modelsTraiffSlabs MdcTariffSlabs */
<section class="content">
<div class="box">
    <div class="box-body">

<?= $this->render('_form', [
    'model' => $model,
    'modelsTariffSlabs' => $modelsTraiffSlabs,
]) ?>

</div>
</div>
</section>

When I try to open my form I am getting this

PHP Notice – yii\base\ErrorException
Undefined variable: modelsTraiffSlabs

Any help would be highly appreciated

Just error 'modelsTraiffSlabs' => 'modelsTariffSlabs'