[edyun]

The problem is not in your code,your Web Hosting either does not suport PHP,i've got this problem myself a few weeks ago and I was in need of reinstalling the PHP,or,the PHP version doesn't match and there are old string that you use,or you did not used INDEX.PHP for your first loading page.
You should contact your hosting provider,they can help you with anything about this.
I hope I helped you.