Fatal error: PHP notice in file /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/event/listener/StructuredTemplateUserMessagesNotificationListener.class.php (23): Use of undefined constant MODULE_USER_NOTIFICATION - assumed 'MODULE_USER_NOTIFICATION'

Information:

error message: PHP notice in file /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/event/listener/StructuredTemplateUserMessagesNotificationListener.class.php (23): Use of undefined constant MODULE_USER_NOTIFICATION - assumed 'MODULE_USER_NOTIFICATION'
error code: 0
file: /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/WCF.class.php (281)
php version: 5.2.4-2ubuntu5.17
wcf version: 1.1.8 (Tempest)
date: Tue, 30 Aug 2011 19:33:47 +0000
request: /index.php?page=Index
referer: http://www.spieleprogrammierer.de/board4-sonstiges/board20-offtopic/16380-die-perfekte-tastatur-gibts-die-%C3%BCberhaupt/
Stacktrace:

#0 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/event/listener/StructuredTemplateUserMessagesNotificationListener.class.php(23): WCF::handleError(8, 'Use of undefine...', '/var/www/vhosts...', 23, Array)
#1 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/event/EventHandler.class.php(207): StructuredTemplateUserMessagesNotificationListener->execute(Object(StructuredTemplate), 'StructuredTempl...', 'shouldDisplay')
#2 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/system/template/Template.class.php(255): EventHandler::fireAction(Object(StructuredTemplate), 'shouldDisplay')
#3 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/page/AbstractPage.class.php(100): Template->display('index')
#4 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/page/AbstractPage.class.php(46): AbstractPage->show()
#5 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/util/RequestHandler.class.php(64): AbstractPage->__construct()
#6 /var/www/vhosts/spieleprogrammierer.de/httpdocs/wcf/lib/util/RequestHandler.class.php(92): RequestHandler->__construct('Index', Array, 'page')
#7 /var/www/vhosts/spieleprogrammierer.de/httpdocs/index.php(8): RequestHandler::handle(Array)
#8 {main}