[Exim4U] No such file or directory: while opening or reading /Maildir/maildirsize

Hi I install a new exim4u mail server and copied all my old vexim user folders over, everything seems to be working fine, i can send emails and with new accounts i create i can receive mails but when i want to send emails to the users i copied over from vexim i get this error: defer (2): No such file or directory: while opening or reading /o_mail/mydomain.com/username/Maildir/maildirsize Checking inside the old vexim mail folders this file those not exist but its on the new onces created exim4u. how can i solve this problem, am using debian. Thanks Kebba