[imp] opening an email results in a blank page!

[ombera at ecb.co.zw]

I hav installed Kolab 2.2 + horde opening an email results in a blank  
page being displayed. sending and recieving works fine all my logs  
seem not to be reporting any errors except the PHP-errors log which is  
showing something like what i have below. Someone help please been  
woking on this error for 2 weeks to no avail

[20-Sep-2009 00:03:53] PHP Warning:   
Horde_History::require_once(DB.php) [<a  
href='horde-history.require-once'>horde-history.require-once</a>]:  
failed to open stream: No such file or directory in  
/kolab/lib/php/Horde/History.php on line 65
[20-Sep-2009 00:03:53] PHP Fatal error:  Horde_History::require_once()  
[<a href='function.require'>function.require</a>]: Failed opening  
required 'DB.php'  
(include_path='/kolab/var/kolab/www/horde/lib:.:/kolab/lib/php:/kolab/var/kolab/php:/kolab/var/kolab/php/pear') in /kolab/lib/php/Horde/History.php on line  
65

regards

Omen

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