我的Laravel 4应用程序在上传到我的网站时显示错误

I am new to Laravel 4. When I upload my app to my website it shows errors. How should I configure it to fix it?

Warning: require(__DIR__/../bootstrap/autoload.php) [function.require]: failed to open stream: No such file or directory in /home/a4651312/public_html/laravel/public/index.php on line 21 

PHP Error Message  Fatal error: require() [function.require]: Failed opening required '__DIR__/../bootstrap/autoload.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/a4651312/public_html/laravel/public/index.php on line 21.

I put my app (name laravel) in public_htmt and sent a link from default.html to public.