Linux Mail Server Setup and Howto Guide

hi  admin

Access Squirrelmail  Options

display a blank page,Please help me

apache error log:

[client 192.168.0.5] PHP Fatal error:  Call to undefined function:  check_plugin_setup() in /var/www/extsuite/webmail/plugins/change_passwd/functions.php on line 26, referer: http://mail.test.com/webmail/s…..ptions.php

# vi change_passwd/config.php

$overridePathToChpasswd = 'ldap-chpasswd';

$changePasswdInLogin = 1;

# vi webmail/config/config.php

$plugins[0] = 'change_passwd';

thanks admin

# cat /proc/version
Linux version 2.6.9-67.ELsmp  (gcc version 3.4.6 20060404 (Red Hat 3.4.6-9) #1 SMP Fri Nov 16 12:48:03 EST 2007

# cat /etc/redhat-release
CentOS release 4.6 (Final)

squirrelmail-1.4.19.tar.bz2

Version 4.2f

Released on July 19, 2009
[ download ]    Requires: SquirrelMail 1.2.8, Compatibility plugin

Cannot use squirrelmail-1.4.19,whether?