Trouble with view_cell

Hi folks,
I tried to use the view_cell() function in a view file, but I always get an error: 

Code:

TypeError

Return value of CodeIgniter\View\Cell::render() must be of the type string, null returned

My view file is very simple, I just inserted a view_cell() in the default CI welcome_message.php:

Code:

<div class="heroe">
    <h1>Welcome to CodeIgniter <?= CodeIgniter\CodeIgniter::CI_VERSION ?></h1>
    <h2>The small framework with powerful features</h2>
</div>
</header>

<!-- CONTENT -->

<?=view_cell('\App\Controllers\TestController::bar')?>

<section>
    <h1>About this page</h1>

The TestController.php (which has no constructor!) has a simple method:

Code:

public function bar()
{
    echo 'BAR';
}

I use no params, so it's a very simple test but I keep on getting this error!

Many thanks for the golden tip! 

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