Public Folder Setup with Kirby 4.5.0

I have been using a public folder setup with 4.3.0 successfully.
Changing to 4.5.0 has caused an error.
I have removed server.php and changed my package.json script to

 "server": "php -S localhost:8888 -t public_html ./kirby/router.php",

My index.php is in public_html and looks like this

<?php

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

$kirby = new Kirby\Cms\App([
  'roots' => [
    'index'    => __DIR__,
    'base'     => $base = dirname(__DIR__),
    'content'  => $base . '/content',
    'site'     => $base . '/site',
    'storage'  => $storage = $base . '/storage',
    'accounts' => $storage . '/accounts',
    'cache'    => $storage . '/cache',
    'sessions' => $storage . '/sessions',
  ]
]);

echo $kirby->render();

My file structure looks like this

What was the error? There shouldn’t have been a need to make any changes to the setup.

This is the error ’ Fatal error : Uncaught Error: Class “Kirby\Toolkit\Config” not found in C:\Kirby\NC4\kirby\src\Cms\App.php:1030 Stack trace: #0 C:\Kirby\NC4\kirby\src\Cms\App.php(106): Kirby\Cms\App->optionsFromConfig() #1 C:\Kirby\NC4\public_html\index.php(5): Kirby\Cms\App->__construct(Array) #2 C:\Kirby\NC4\kirby\router.php(15): require(‘C:\Kirby\NC4\pu…’) #3 {main} Next Error: Class “Kirby\Toolkit\Str” not found in C:\Kirby\NC4\kirby\src\Http\Environment.php:904 Stack trace: #0 C:\Kirby\NC4\kirby\src\Http\Environment.php(885): Kirby\Http\Environment::sanitizeHost(‘localhost’) #1 C:\Kirby\NC4\kirby\src\Http\Environment.php(875): Kirby\Http\Environment::sanitize(‘SERVER_NAME’, ‘localhost’) #2 C:\Kirby\NC4\kirby\src\Http\Environment.php(167): Kirby\Http\Environment::sanitize(Array) #3 C:\Kirby\NC4\kirby\src\Http\Environment.php(110): Kirby\Http\Environment->detect(Array, Array) #4 C:\Kirby\NC4\kirby\src\Cms\App.php(618): Kirby\Http\Environment->__construct() #5 C:\Kirby\NC4\kirby\src\Cms\AppErrors.php(68): Kirby\Cms\App->environment() #6 C:\Kirby\NC4\kirby\src\Cms\App.php(113): Kirby\Cms\App->handleErrors() #7 C:\Kirby\NC4\public_html\index.php(5): Kirby\Cms\App->__construct(Array) #8 C:\Kirby\NC4\kirby\router.php(15): require(‘C:\Kirby\NC4\pu…’) #9 {main} thrown in C:\Kirby\NC4\kirby\src\Http\Environment.php on line 904