Error after updating to 2.0 form 1.0

I recently updated my livewire from v1 to 2 my component was working perfectly but after the update everything blows up.

 $dom = \Livewire\Livewire::mount('contact-form', [])->dom;

} elseif ($_instance->childHasBeenRendered('J9jn1hb')) {

    $componentId = $_instance->getRenderedChildComponentId('J9jn1hb');

    $componentTag = $_instance->getRenderedChildComponentTagName('J9jn1hb');

    $dom = \Livewire\Livewire::dummyMount($componentId, $componentTag);

    $_instance->preserveRenderedChild('J9jn1hb');

} else {

    $response = \Livewire\Livewire::mount('contact-form', []);

    $dom = $response->dom;

    $_instance->logRenderedChild('J9jn1hb', $response->id, \Livewire\Livewire::getRootElementTagName($dom));

}

echo $dom;

?>