laravel Server error 500 in cpanel hosting

im hosting laravel 5.1 in my cpanel but it always accured error.I tried every method (htaccess, chmod 644 and storage give o r+W) but it doesnt work in my cpanel but when i removed following line from index.php of public folder it give acces to inde file:

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

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

$response->send();

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

so it give access to mine folder . Can anybody help me? can it cause due to php version of cpanel?

via Chebli Mohamed