I know this thread is about 100 years old, but what the heck......
Its very likely that the error got nothing to do with the Rolling Hills map, but mabye with the fact that it is
a mod map. I´m playing the FelsbrunnEdit by MC V.1.4 and i had the same error yesterday and had to use
your "fix" to get my savegame running again. I´m pretty sure the problem comes from the mainscript of the
FS. If i´m wrong and you guys work out a fix it would be nice of you if you would post it here.
Sorry, my english grammar is a bit rusty