AKScheduling: Give error message if scheduling Slot fails
if placing an event in the calendar is not successfult, i.e. the AK Slot is placed back in the unscheduled list. give a reason why (e.g. there is no room)
if placing an event in the calendar is not successfult, i.e. the AK Slot is placed back in the unscheduled list. give a reason why (e.g. there is no room)