I keep getting this error on Slim 4 after installing new version 4.12 - slim

Question

I keep getting this error Slim Application Error after installing the new Slim 4 framework.
I tried switching back to old version of slim but I keep getting the same thing.
<?php
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;
require __DIR__ . '/../vendor/autoload.php';
/**
* Instantiate App
*
* In order for the factory to work you need to ensure you have installed
* a supported PSR-7 implementation of your choice e.g.: Slim PSR-7 and a supported
* ServerRequest creator (included with Slim PSR-7)
*/
$app = AppFactory::create();
// Add Routing Middleware
$app->addRoutingMiddleware();
/*
* Add Error Handling Middleware
*
* #param bool $displayErrorDetails -> Should be set to false in production
* #param bool $logErrors -> Parameter is passed to the default ErrorHandler
* #param bool $logErrorDetails -> Display error details in error log
* which can be replaced by a callable of your choice.
* Note: This middleware should be added last. It will not handle any exceptions/errors
* for middleware added after it.
*/
$errorMiddleware = $app->addErrorMiddleware(true, true, true);
// Define app routes
$app->get('/hello/{name}', function (Request $request, Response $response, $args) {
$name = $args['name'];
$response->getBody()->write("Hello, $name");
return $response;
});
// Run app
$app->run();
Output:
Slim Application Error
The application could not run because of the following error:
Details
Type: Slim\Exception\HttpNotFoundException
Code: 404
Message: Not found.
File: /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php
Line: 91
Trace:
#0 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php(57): Slim\Middleware\RoutingMiddleware->performRouting(Object(Slim\Psr7\Request))
#1 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/MiddlewareDispatcher.php(132): Slim\Middleware\RoutingMiddleware->process(Object(Slim\Psr7\Request), Object(Slim\Routing\RouteRunner))
#2 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php(89): class#anonymous->handle(Object(Slim\Psr7\Request))
#3 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/MiddlewareDispatcher.php(132): Slim\Middleware\ErrorMiddleware->process(Object(Slim\Psr7\Request), Object(class#anonymous))
#4 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/MiddlewareDispatcher.php(73): class#anonymous->handle(Object(Slim\Psr7\Request))
#5 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/App.php(206): Slim\MiddlewareDispatcher->handle(Object(Slim\Psr7\Request))
#6 /opt/lampp/htdocs/MyocappAPI/vendor/slim/slim/Slim/App.php(190): Slim\App->handle(Object(Slim\Psr7\Request))
#7 /opt/lampp/htdocs/MyocappAPI/public/index.php(41): Slim\App->run()
#8 {main}

Answer 1

I'm glad OP figured it out, but he didn't share his solution so here is what worked for me:
$app = AppFactory::create();
$app->setBasePath("/slimapp/public/index.php");
where the full path to my starter page is:
C:\xampp\htdocs\slimapp\public\index.php
To test my starter page, the URL I used was:
localhost/slimapp/public/index.php/hello/Beautiful
I think in Slim 3 you didn't need to manually set the base path, but you do in Slim 4. I don't know if it's a bug but this worked.

Answer 2

Slim 4 has some bugs in routing. So,Downgrade the slim version to 3.*
Reference:
https://discourse.slimframework.com/t/slim-4-httpnotfoundexception/3273/18