I'm at my wits end. I've upgraded my iPod Touch 3g to IOS5 and everything seemed fine. Afterwards, when I synced newly converted e-books (from PDF to epub using Calibre), this error appears: "This page contains the following errors: error on line 1 at column 1: document is empty error on line 1 at column 1:Encoding error." I've tried restoring my iPod but it still didn't work. Now, I don't even want to sync my iPad2 on my laptop. >_< Somebody please help me.