Board Thread:Bug Reports/@comment-29883313-20160909202705/@comment-27219153-20160910004931

You are getting the same error as other people were, but Mevans said he fixed it here. Also, here is another example of someone having this problem (its about halfway down the page).

Other than downgrading forge (which I doubt will help at all) to 1.7.10 - 10.13.4.1558, I'm not sure what to do. I would normally suggest to try it without other mods, but since other people have had this problem without other mods I don't think its necessary.

If Mevans really did fix this, then my explanation for why it is still happening would be that it happened in 29.3 and it 'corrupted' your world.