Check your apache error log, by default its /var/log/apache2/error.log

Also make sure that /path/to/laravel/public is the document root and not /path/to/laravel

Thanks,

Nothing can be found which points this error : The exact error that I see is this :

ErrorException (E_UNKNOWN)

file_put_contents(/var/www/html/cats/app/storage/sessions/dd412fdbc6afa42da845de509d0e356e08361b15): failed to open stream: Permission denied

Open: /var/www/html/cats/bootstrap/compiled.php
    }
    public function requireOnce($file)
    {
        require_once $file;
    }
    public function put($path, $contents)
    {
        return file_put_contents($path, $contents);
   }
    public function prepend($path, $data)

Roelof

You need to chmod app/storage to be writeable.

chmod -R 775 app/storage

Also done several times. If the app/storage is not 755 then php artisan serve would also not work,