Crashes when loading my map

I have not played Minecraft for about six months. The map that I created loads fine previously. But now, it always crashes when loading it. I save a backup copy of my world also and it does not work either. The map that I paid for previously, still works somehow. I think the newer version ruined it. Please fix this issue soon! I spend several months creating the map . UPDATE: Just tried the beta version and it works!!!!! . Can't wait for official release.