fatal: proxymap service is not configured for table "mysql:/etc/postfix/mysql-virtual_outgoing_bcc.c

Hello,
i have updated ISPconfig instalallation from 3.0.5.4 to latest 3.1 (On Debian 7 wheezy)

When i try t send email, I'm getting errorslike:
Nov 2 20:27:23 mail postfix/cleanup[24382]: fatal: proxymap service is not configured for table "mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf"

When i comment it out in /etc/postfix/main.cf
#sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
sending mail is working.
How to fix this?

FYI: the file is there
# cat /etc/postfix/mysql-virtual_outgoing_bcc.cf
user = ispconfig
password = xxxxxxxxxxxxxxxxxxxxxx
dbname = dbispconfig
table = mail_user
select_field = sender_cc
where_field = email
additional_conditions = and postfix = 'y' and disabledeliver = 'n' and disablesmtp = 'n' and sender_cc != ''


Regards
R.H.