WCF::handleException() Unhandled exception: Call to a member function canRead() on null

#0 /www/htdocs/w009c37a/forumneu/wcf/lib/page/AbstractPage.class.php(99): calendar\page\EventPage->readParameters()
#1 /www/htdocs/w009c37a/forumneu/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
#2 /www/htdocs/w009c37a/forumneu/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
#3 /www/htdocs/w009c37a/forumneu/calendar/index.php(10): wcf\system\request\RequestHandler->handle('calendar')
#4 {main}