Form validation in model

I changed my view to: (edit code)

PHP Code:

<h2><?= esc($title); ?></h2>

<form action="/news/create" method="post">
    <label for="title">Title</label>
    <br>
    <?php if(isset($errors['title'])){echo $errors['title'].'<br>';}?>
    <input type="input" name="title" /><br />

    <label for="body">Text</label>
    <br>
    <?php if(isset($errors['body'])){echo $errors['body'].'<br>';}?>
    <textarea name="body"></textarea><br />
    <input type="submit" name="submit" value="Create news item" />
</form> 


...so problem solved. But, why didn't this vork in the view: <?= \Config\Services::validation()->listErrors(); ?>