Whenever I try to load my single player world it says that Forge Mod loader is detecting that backup level.dat is being used and that this is bad thing and that I should backup my world before continuing. I backed up my world but it still won't let me continue on? It dispays a yes button which if i click, nothing happens, and a no button which if I click it sends me to the main menu. What does this mean and how can I fix it? How do I change it so that level.dat backup is not being used?
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