PHP no-framework-tutorial class not found

Question

I try to build test project with PatrickLouys/no-framework-tutorial My Controllers/BaseController.php:

<?php

namespace Example\Controllers;

class BaseController
{
    public function test(){
        echo 'test';
    }
}

And index.php file:

<?php

namespace Example;

require __DIR__.'/vendor/autoload.php';

// come code with routes

case \FastRoute\Dispatcher::FOUND:
        $className = $routeInfo[1][0];
        $method = $routeInfo[1][1];
        $vars = $routeInfo[2];

        $class = new $className; <-- load the class specified in the routes
        $class->$method($vars);
        break;

// some code

When I tried run this code I got error:

Class 'Example\Controllers\BaseController' not found

Can you please tell me where I made a mistake?