roundcube 0.3rc1 change password plugin

[garry]

- I've installed Roundcube 0.3RC1 and it works very well (I can send/receive emails, create folders...),
- I've enabled the password plugin in main.inc.php and I've created plugins/password/config.inc.php,
- I can see the 'password' tab in Roundcube, but when I try to change password I get this error: 'Could not save new password.'

Can anyone know how to make it work?

Thanks in advance

my error log:

[Mon Aug 31 23:57:01 2009] [warn] mod_fcgid: stderr: MDB2 Error: not found (-4): _doQuery: [Error message: Could not execute statement]
[Mon Aug 31 23:57:01 2009] [warn] mod_fcgid: stderr: [Last executed query: SELECT update_passwd('$1$jvVk5x?/$BzII8KOGrJLNCfYvigM05/', 'users@xxxxx.hk')]
[Mon Aug 31 23:57:01 2009] [warn] mod_fcgid: stderr: [Native code: 1305]
[Mon Aug 31 23:57:01 2009] [warn] mod_fcgid: stderr: [Native message: FUNCTION roundcubemail.update_passwd does not exist]
[Mon Aug 31 23:57:01 2009] [warn] mod_fcgid: stderr: PHP Notice: MDB2 Error: not found Query: _doQuery: [Error message: Could not execute statement] [Last executed query: SELECT update_passwd('$1$jvVk5x?/$BzII8KOGrJLNCfYvigM05/', 'users@xxxxx.hk')] [Native code: 1305] [Native message: FUNCTION roundcubemail.update_passwd does not exist] in /var/www/ispcp/gui/tools/roundcube3/program/include/bugs.inc on line 86
[Mon Aug 31 23:57:01 2009] [error] [client 1.2.3.4] File does not exist: /var/www/ispcp/gui/tools/roundcube3/undefined, referer:http://xxx.xx.xx/webmail3/?_task=settings&_action=plugin.password-save


http://www.roundcube.net/downloads
RoundCube Patches & Plugins
http://trac.roundcube.net/browser/trunk/...s/password