#1 Error Clicking on Settings/Vacation

[SKG]

Hi - New install of Roundcube 0.9.5-1 (works fine) and Vacation 1.9.9 - Centos 6.
Postfix 2.11.0-0
PostfixAdmin 2.3.7
PgSQL 9.3
Dovecot 2.0.21-2
PHP 5.3.27-3

I'm getting this error
PHP Fatal error: Class 'rcube_mdb2' not found in /usr/share/roundcubemail/plugins/vacation/lib/virtual.class.php on line 26

config.ini:

driver= "virtual"
dsn = "pgsql://postfix:password@localhost"
transport = "vacation.domain.com"
dbase = "postfix"
always_keep_copy = true
select_query = "SELECT goto FROM %m.alias WHERE address='%e' AND goto='%g'"
delete_query = "DELETE FROM %m.alias WHERE domain='%d' AND address='%e'"
insert_query = "INSERT INTO %m.alias (address,goto,domain) VALUES ('%e','%g','%d')"
createvacationconf = true
always_keep_message = true
disable_forward = false

Appreciate any help