Horde Problem login

[The Afif]

Dear Horde,

I've installed horde and imp at My RedHat 7.0, and I ve error, when
login to IMP i had an error like this


Warning: Access denied for user: 'horde@localhost' (Using password: YES)
in /home/httpd/html/horde/imp/lib/db.mysql on line 153

Warning: Cannot add header information - headers already sent by (output started at
/home/httpd/html/horde/imp/lib/db.mysql:153) in /home/httpd/html/horde/lib/horde.lib on line 1174

Warning: Cannot add header information - headers already sent by (output started at
/home/httpd/html/horde/imp/lib/db.mysql:153) in /home/httpd/html/horde/phplib/session.inc on line 448

Warning: Cannot add header information - headers already sent by (output started at
/home/httpd/html/horde/imp/lib/db.mysql:153) in /home/httpd/html/horde/phplib/session.inc on line 449

Warning: Cannot add header information - headers already sent by (output started at
/home/httpd/html/horde/imp/lib/db.mysql:153) in /home/httpd/html/horde/phplib/session.inc on line 450

Warning: Cannot add header information - headers already sent by (output started at
/home/httpd/html/horde/imp/lib/db.mysql:153) in /home/httpd/html/horde/lib/horde.lib on line 465

do the IMP support Vpopmail authentication?
any help and solution would be appreciated

I've installed my Redhat with this option

Qmail-1.03
Vpopmail-4.9.8
qmailadmin-4.2
MySQL-3.23
Php-4.0.4



Best regards,
The Afif
mailto:ogsedp@rad.net.id