CakePhp 4.x basic Authentication - cakephp

Question

I am following the CakePHP 4.x tutorial to the letter (as far as I can see) until chapter "CMS Tutorial - Authentication".
Half way through "Now, on every request, the AuthenticationMiddleware will inspect the request session to look for an authenticated user. If we are loading the /users/login page, it will also inspect the posted form data (if any) to extract the credentials."
When I try to access articles or users I get an error:
( ! ) Fatal error: Interface
'Authentication\AuthenticationServiceProviderInterface' not found in
C:\wamp64\www\cake\src\Application.php on line 41
I have tried to figure out why this would be, but I cannot find it. I have tried looking up the same problem on the internet, no dice. Not even a mention that this could be security related (I found a mention about strict brower settings earlier but it was related to another problem).
I have uploaded my code on Github here: https://github.com/plafeber/cakephp-tutorial
I would greatly appreciate any feedback. I was under the assumption that if I create the full code set from the tutorial, given of course I run CakePHP 4.1.5 and follow the related Cake 4.x manual, that it would work. However, I already found out that I have to change the line about the use of DefaultPasswordHasher compared to what was in the code. So I can imagine the Tutorial page is not exactly as it should be.
This would be hte correct line about the use of the DefaultPasswordHasher in User.php;
//the use line
use Cake\Auth\DefaultPasswordHasher as AuthDefaultPasswordHasher;
//and the function
protected function _setPassword(string $password) : ?string
{
if (strlen($password) > 0) {
$hasher = new AuthDefaultPasswordHasher();
return $hasher->hash($password);
}
}

Answer 1

The solution to this was to navigate to the Cake install dir (containing the src and config folder and so on), then running the Composer call again. This apparently placed the filed in the right directories and then the error no longer appeared.