[Dovecot] doveadm director remove error

Hi, with the version 2.0.rc3, when I try to remove a mail server from director list, get this error:

doveadm director remove 10.180.188.21 (null): doesn't exist

but the other commands are working without problem ...

doveadm director status mail server ip vhosts users 10.180.188.21 100 2 10.180.188.22 100 3

thanks

Xavier