Voho

Me and a close friend have been playing on a private server for the past few days, and we have a large stockpile of items stored in lockers. However, this afternoon (everything was fine earlier) we encountered some error messages related to entities, which can be found in this pastebin: http://pastebin.com/HeWdc41E Now every single non-vanilla block (as far as I've seen) is missing, including all of our items within lockers. Please, how can we recover all of our progress and loot?!