Board Thread:LotR Mod Technical Support/@comment-172.73.186.78-20170130224943/@comment-27219153-20170130232507

From what I could find other places, it looks like your world got corrupted because it didn't save properly (due to the not responding and shutting down). I don't know if your whole world is corrupted or just the area surrounding your current location. I would suggest deleting the terrain around your current location, either by using a program like MCEdit (if you know how to use it), or just by deleting the region files around your current location. To delete the region files go to your minecraft saves folder and follow the path: LOTR Things to DO/MiddleEarth/region/ Find the two files labeled r.74.-12.mca, and r.74.-11.mca and delete them (you may want to save them elsewhere in case this doesn't work). Warning: This will delete all terrain (including structures you have built) around your current location. Then launch minecraft and try joining your world.

If minecraft stops responding frequently, you may want to take regular backups to avoid problems like this in the future.