I'm not able to get controller to work

[bojo02]

Hello, i'm trying to understand how the controller works.

Here is my code:
themes/demo/navbar/controller.php

<?php

namespace Vendor\Hansschouten\LaravelPagebuilder\Themes\Demo\Blocks\Navbar;

use PHPageBuilder\Modules\GrapesJS\Block\BaseController;

class Controller extends BaseController
{
    /**
     * Handle the current request.
     */
    public function handleRequest()
    {
        return 'asdf';
    }
}

When i open the page builder, it's showing this error:

Class "Vendor\Hansschouten\LaravelPagebuilder\Src\..\Themes\Demo\Blocks\Navbar\Controller" not found

Once i delete the controller.php file, the page builder is working fine, once i create it the error pops up.

Any idea what i'm missing?

PS. - I'm using Laravel 9.52.18