laravel 5.2 internal server error

My laravel project work good in localhost by artisan serve commend. Now i'm trying to host it on web host. I upload my project under public_html and copy all files from public folder i also edit app.php 'debug' => env('APP_DEBUG', true), for showing the error.

i edit index.php

require __DIR__.'/bootstrap/autoload.php';
$app = require_once __DIR__.'/bootstrap/app.php';

but it still give a 500 Internal server error back.

I also try an another way, Upload my project into root directory except public folder and upload public folder into public_html directory . and i edit index.php as

require __DIR__.'/laravel/bootstrap/autoload.php';
$app = require_once __DIR__.'/laravel/bootstrap/app.php';

i can't find what wrong with my code. how can i deploy my laravel 5.2 project into a web hosting.?

via Chebli Mohamed