If you have a big world file in Minecraft, then, you delete and reinstall Minecraft, my world fails to sync the data. The world is 260.1 megabytes. First, it starts syncing the world. Then, it goes to a second syncing screen. Then, a black box with a loading bar for syncing appears. After it loads, it shows the second syncing screen again. Then, for little world files, it joins the world, but for big world files, there is an error. Luckly, I had a copy of the world that was 40 megabytes.