That error means that the server didn’‘t offer you that field. I checked the XEP-45 spec and that field is not listed in there. BTW, Wildfire doesn’'t support that field either. Not sure where you got that field name from.
To control the amount of history to get when joining a room you can control it 1) from the server (in case you are using Wildfire) or 2) from the client while joining the room MultiUserChat#join(String nickname, String password, DiscussionHistory history, long timeout). Note the DiscussionHistory being passed as a parameter.