Facebook "This Request can't be sent"?

This Request Can't Be Sent
Do you know this user personally? To prevent misuse of Facebook, this request can't be sent. To learn more, please visit the Help Center. If you believe you're seeing this message in error, you can report the problem.This is the message I get for adding my mutual friends on facebook. Does anybody know if this message is temporary or permanent? If temporary, how long will it last. please help me,now.
Anonymous User
Anonymous User
Asked Apr 27, 2013

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.