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#0 /var/www/sis.leibniz-remscheid.de/html/core/classes/User.class.php(151): sis\User->load() #1 /var/www/sis.leibniz-remscheid.de/html/core/classes/User.class.php(1230): sis\User->__construct('', true) #2 /var/www/sis.leibniz-remscheid.de/html/core/classes/Appointment.class.php(389): sis\User::getMailAddress('') #3 /var/www/sis.leibniz-remscheid.de/html/core/classes/Appointment.class.php(475): sis\Appointment->toICal() #4 /var/www/sis.leibniz-remscheid.de/html/modcal/ctrl.php(95): sis\Appointment->sendToBrowser() no login supplied