Archive Folder Error

Hello, when I log in to my webmail account on my domain and I click on my archive folder, I get this error:

Server Error: Unable to send command: A0005 FETCH 1:* (UID FLAGS INTERNALDATE BODY.PEEK[HEADER.FIELDS (DATE)])

Any help greatly appreciated,

I have tried rebooting the server and made sure things are up-to-date.

have you looked at your log right after getting the error /var/log/mail.log —maybe out of memory or HD?