World crashes when loading a world

One world I've been playing for a long time suddenly crashes upon loading. I've tried the trick of copying chunks.dat into the directory of a newly-created world, but it still crashes. I also have tried BlockLauncher, still crashes. Attached a tarball of the offending world. If it could be fixed that'd be amazing, since I've got a kick-ass castle in there!!

This is on a stock HTC One with JellyBean 4.3.