LordRohanik

Well, it isn't survival, but for the sake of not losing your world, if you place a nether portal piece from NEI down, that will take you to a portal in the nether, which you can then re-enter to get you back to the overworld. Just make sure that it's the actual purple portal piece, don't build a full portal.

I have used this fix sucessfuly, however it needs repeating. I can do the fix and it works fine, then the next day I get the same message, and have to pull out my save file, redownload from the launcher and put the save back in. It is functional, but not ideal. I am only attempting to run Lite at the moment, if I pull lite it works after the fix, but if I also pull classic, then lite gives me the error again.