Minecraft how to fix IOException? - 2

You can't. It's an *exception* which means that the program isn't always expected to deal with it much less the client. It's basically a circumstance that should never happen if every thing is working right.

This is what I recommend:
- Backup your personal files, game saves, player skins, custom maps you've already started.
- Separately back up any old texture packs, old mods, old custom maps.
- Make sure your Java (or Jdk) is updated to the most current stable version.
- Reinstall Minecraft.
- Then one by one, put in your old game saves, your player skins, and reinstall your custom maps.
- Then one by one, reinstall your texture packs.
- Finally one by one, reinstall your mods.

Mods are more likely to have compatibility errors. Try to reinstall rather than copy older versions, and try to go with the newest versions available.

This step by step method will let you see which things work and which don't. If something doesn't work, uninstall it from Minecraft. Unfortunately, you're going to have to write the person who uploaded it if you really want to see an update.

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