Server 500 Error - Laravel

I have developed my own website by using Laravel.It is working fine in Localhost.

So I have moved my files into live server(byethost.com). When I'm trying to access my site, I got an error (Server Error 500). I am new to this laravel.Please Any one help me to solve my problem.

Note: Moved all local files into public_html folder in server. then moved public_html/public files to public_html directory in server.And also changed path in app file.

code: require __ DIR__.'/bootstrap/autoload.php'; $app = require_once __ DIR__.'/bootstrap/app.php';

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via Chebli Mohamed