Fatal error: Unable to find class file '/www/htdocs/w00995e6/traitdunion-onlineEUintranet/wbb/lib/system/event/listener/UserPagePostsListener.class.php'

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Information:

error message: Unable to find class file '/www/htdocs/w00995e6/traitdunion-onlineEUintranet/wbb/lib/system/event/listener/UserPagePostsListener.class.php'
error code: 11000
file: /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/system/event/EventHandler.class.php (173)
php version: 5.5.38-nmm2
wcf version: 1.0.11 pl 3 (Horizon)
date: Thu, 19 Apr 2018 15:30:55 +0000
request: /index.php?page=User&userID=40&s=319f0237bae17c41293a3ff4c905977cd333d904
referer:

Stacktrace:

#0 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/page/AbstractPage.class.php(44): EventHandler::fireAction(Object(UserPage), 'readParameters')
#1 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/page/UserPage.class.php(44): AbstractPage->readParameters()
#2 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/page/AbstractPage.class.php(35): UserPage->readParameters()
#3 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/page/UserPage.class.php(37): AbstractPage->__construct()
#4 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/util/RequestHandler.class.php(63): UserPage->__construct()
#5 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('User', Array, 'page')
#6 /www/htdocs/w00995e6/traitdunion-onlineEUintranet/index.php(8): RequestHandler::handle(Array)
#7 {main}