Sorry for the downtime of the server, at the time I'm writing the post server is unjoinable already for 16 hours, player inventories are being converted on to new per world inventory plugin, since old one was causing inventory losses in Friendly Survival. I'm not exactly sure when this will be over but if using math and any additional needed testing times, it should take a total of 22 hours to be over, if things goes wrong we might need to add another 24 hours to it. 16 hours has already passed so it's 6 hours left. All this is done to save the inventories of players from being deleted.
EDIT: Server is back up, all problems with inventories fixed.