Dovecot lda-dupes

Hi,

Since I enabled shared mailboxes I'm having these errors:

Sep 27 21:22:41 doveadm(francis@med-lo.eu): Error: Failed to access mailbox dovecot/lda-dupes: stat(/var/mail/vmail/med-lo.eu/francis/.dovecot.lda-dupes/tmp) failed: Not a directory

And replication stopped.

How can I fix this?

Best, Francis