[Tickets #9003] Cannot modify header information - headers already sent

[bugs at horde.org]

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Ticket URL: http://bugs.horde.org/ticket/9003
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  Ticket             | 9003
  Created By         | chris at vandenberghe.org
  Summary            | Cannot modify header information - headers already sent
  Queue              | Horde Groupware Webmail Edition
  Version            | 1.2.5
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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chris at vandenberghe.org (2010-05-03 11:00) wrote:

Hi,

I chose "Horde Groupware Webmail Edtion 1.2.5 Final" as "Horde  
Groupware Webmail Edtion 1.2.6 Final" is not yet in the list.  The  
issue is however in 1.2.6.

After installing Horde I get the following message when accessing index.php:

Warning: Cannot modify header information - headers already sent by  
(output started at /path/horde-webmail-1.2.6/pear/php/Log.php:169) in  
/path/horde-webmail-1.2.6/index.php on line 97

Apache 2.2.14
Ubuntu server 10.04
PHP 5.3.2

Any idea what this could be?

Thanks,
Chris.