How Can i send the Message or Notification to Particular Friend In Facebook

How Can i send the Message or Notification to Particular Friend In Facebook

I need to send the Notification or Message to Particular Friend In
Facebook, I have used the WCF Webservice and i also get the Friend's ID
but when i send the message or Notification then I m getting the Following
Error AS "(OAuthException - #200) (#200) Feed story publishing to other
users is disabled for this application"
Please reply me ASAP Thanks in Advance !!!
Nikunj