[horde] passwd error

[Kenneth Miles]

I have passwd installed using the poppassword backend for users to  
change their password on Ubuntu 8.04.
The password changes to the new password but at the top of the the  
page the following errors are printed -

Notice: Only variable references should be returned by reference in  
/usr/share/horde3/passwd/lib/Driver.php on line 110

Warning: Cannot modify header information - headers already sent by  
(output started at /usr/share/horde3/passwd/lib/Driver.php:110) in  
/etc/horde/passwd3/templates/common-header.inc on line 4

Warning: Cannot modify header information - headers already sent by  
(output started at /usr/share/horde3/passwd/lib/Driver.php:110) in  
/etc/horde/passwd3/templates/common-header.inc on line

Thanks in advance for any help with this.

Regards, Kenneth.
http://kmiles.co.uk