XMLRPC ERROR Response from server does not contain valid XML

I have previously succeeded in making 200 post via XMLRPC, but strangely 2 days ago I got the error message “Response from server does not contain a valid XML” I’ve been looking for solutions of various site for 2 days but no result.
when i uses the same code to post via xmlrpc in my other wordpress site, i not getting error
you can see my code in here:http://stackoverflow.com/questions/20855336/wp-response-from-server-does-not-contain-valid-xml