The addon mail_queue_addon does not exist

When I view a message/email in the mail_queue (http://IP:2082/index.php?module=mail_queue) I see the new interface in CWP, but after waiting a moment for the message to load I see it reload the CWP interface inside the frame and I see this message under "Attachements" section

"The addon mail_queue_addon does not exist"

This started after CWP updated I do believe.

So I can't view any messages in the mail queue at this time.

Here is a snapshot of the error and issue.

I have the same problem.