Problem with xmlrpc.php

Hi!
My problem appears when trying to connect with wordpress.com to use the plugin jetpack, or to connect to blogsy from ipad.

From Jet pack trying to connect wordpress.com I recieve this report:
Error Details: The Jetpack server could not communicate with your site’s XML-RPC URL. Please check to make sure http://juancarloslucas.com.ar/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.

If I put http://juancarloslucas.com.ar/xmlrpc.php on the browser I recieve this report:
Warning: ini_set() has been disabled for security reasons in /home/juancarl/public_html/wp-includes/load.php on line 278
Warning: Cannot modify header information – headers already sent by (output started at /home/juancarl/public_html/wp-includes/load.php:278) in /home/juancarl/public_html/wp-includes/class-IXR.php on line 372
XML‑RPC server accepts POST requests only.

I hope you can help me.

Thank´s
JUAN