Jetpack not working

MY Jetpack Plugin is not working!

(Error Details: The Jetpack server could not communicate with your site's XML-RPC URL. Please check to make sure http://www.h-makki.com/Blog/xmlrpc.php is working properly. It should show 'XML?RPC server accepts POST requests only.' on a line by itself when viewed in a browser and should not have any blank links or extra output anywhere.)