[Phpgroupware-users] Error with Calendar app

[Gilles FEVRIER]

Hello,

I have this message with the calendar app...

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Warning: Failed opening 
'/var/www/html/CCOS/phpgroupware/calendar/templates/bull-ccos/header.inc.php' 
for inclusion (include_path='.:/php/includes:/usr/share/php') in 
/var/www/html/CCOS/phpgroupware/calendar/inc/class.uicalendar.inc.php on 
line 1831
Template Error: loadfile: head is not a valid handle.
Halted.
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Sorry for these questions, but I am a newbie ! ;)

Gilles