thanks alec, now i got this error
PHP Error: Password plugin: Unable to execute sudo /usr/sbin/chpasswd 2> /dev/null in /home/xx/public_html/mail/plugins/password/drivers/chpasswd.php on line 0 (POST /mail/?_task=settings&_action=plugin.password-save?_task=&_action=)
is it because of the database ? i'm stucked in this situation for 2 days, installing the roundcube for several times but the problem is not solved
my hosting is hostgator, i'm using cpanel - mysql if this can help