public void addNewPastMeeting(Set<Contact> contacts, Calendar date, String text)
	{
		try
		{
			if(contacts.equals(null) || date.equals(null) || text.equals(null))
			{
				throw new NullPointerException();
			}

			if(contacts.isEmpty() || !contactList.containsAll(contacts))
			{
				throw new IllegalArgumentException();
			}

			Meeting newMeeting = this.addNewMeeting(date, contacts, text);

			this.meetingList.add
(newMeeting);

		}catch(NullPointerException ex){
			System.out.println("One of the arguments is null");
		}catch(IllegalArgumentException ex){
			System.out.println("Invalid set of contacts");
		}
	}