[imp] Error when downloading attachment

[Volker Then]

Hi developers.

Downloading attachments of messages with more than one file attached  
gives some errors, when downloading file no.2.

Strange, that somehow the HTTP header appears below the error message:

<br />
<b>Warning</b>:  ldap_mod_replace(): Modify: Unknown error in  
<b>/usr/share/php/Horde/Prefs/ldap.php</b> on line <b>470</b><br />
HTTP/1.1 200 OK
Date: Tue, 30 May 2006 05:30:11 GMT
Server: Apache/1.3.33 Ben-SSL/1.55 (Debian GNU/Linux) PHP/4.3.10-16
X-Powered-By: PHP/4.3.10-16
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Disposition: attachment; filename="Binder3.pdf"
Content-Length: 605644
Keep-Alive: timeout=15, max=98
Connection: Keep-Alive
Content-Type: application/pdf

%PDF-1.6
[...]

I'm getting the same LDAP error on mimp.

What's wrong with either horde or my LDAP installation? Any idea?

Bye

Volker