When i submit my new message form then it shows me following message.

The following recipients will not receive this private message: 448.
You must include at least one valid recipient.

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StatusFileSize
new41.63 KB

Category:task» bug
Priority:Major» Normal
Status:Active» Postponed (maintainer needs more info)

This error is usually displayed when a user is blocked or does not otherwise have permission to receive private messages.

Have you checked your permissions settings?

As it stands, simply posting a screenshot is not a very helpful bug report. Please see the instructions here:
https://drupal.org/node/73179

Status:Postponed (maintainer needs more info)» Closed (cannot reproduce)