once i finish it and click Submit its say

Fatal error:

* rydia123 has chosen not to receive private messages or may not be allowed to receive private messages. Therefore you may not send your message to him/her.

If you are trying to send this message to multiple recipients, remove rydia123 from the recipient list and send the message again.

Unable to proceed with save while $errors array is not empty in class vB_DataManager_PM in [path]/includes/class_dm.php on line 810

whats that mean?

and i can receive private messages.