Page works on xampp but it does not work on the server

it's because your system needs to be set up for production use . for this job you need to look for how to set up laravel project for production use?

What version of Laravel are you using and what level of PHP is running on your server?

I have PHP 7, Laravel Framework 5.5.28.

Seriously for the 999th time set up laravel correctly, even in development. Follow this guide:

http://novate.co.uk/deploy-laravel-5-on-shared-hosting-from-heart-internet/

Main laravel goes ABOVE public_html.

See also https://imgur.com/Oo6k4Fp

And remember Linux is case sensitive, Windows not.

I did everything in the guide and it still does not work.

My index.php:

<?php

/**
 * Laravel - A PHP Framework For Web Artisans
 *
 * @package  Laravel
 * @author   Taylor Otwell <[email protected]>
 */

define('LARAVEL_START', microtime(true));

/*
|--------------------------------------------------------------------------
| Register The Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader for
| our application. We just need to utilize it! We'll simply require it
| into the script here so that we don't have to worry about manual
| loading any of our classes later on. It feels great to relax.
|
*/

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

/*
|--------------------------------------------------------------------------
| Turn On The Lights
|--------------------------------------------------------------------------
|
| We need to illuminate PHP development, so let us turn on the lights.
| This bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight our users.
|
*/

//$app = require_once __DIR__.'/../bootstrap/app.php';
$app = require_once __DIR__.'/../../laravelcore/bootstrap/app.php';

/*
|--------------------------------------------------------------------------
| Run The Application
|--------------------------------------------------------------------------
|
| Once we have the application, we can handle the incoming request
| through the kernel, and send the associated response back to
| the client's browser allowing them to enjoy the creative
| and wonderful application we have prepared for them.
|
*/

$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);

$response = $kernel->handle(
    $request = Illuminate\Http\Request::capture()
);

$response->send();

$kernel->terminate($request, $response);

In config/app.php:

    'url' => env('APP_URL', 'http://laravel.mesiek.xaa.pl'),

The files were placed as in the guide. My subdomain is laravel.mesiek.xaa.pl

Sorry! Everything works :) It turned out that the php version is 5.2. I thought it was 7.0 by default. It was enough to change in the admin panel. Thanks for the help!