Fix Cydia Repo Errors

1. Go to /etc/apt/sources.list.d/
2. Open "cydia.list" etc.
3. Look for the sources causing the problem and delete or comment it out.
4. Open Cydia and you'll see.

http://www.jailbreaknews.com/how-to-fix-cydia-repo-errors-using-your-idevicve-or-computer/