Go into your \Launchbox\Backups folder and look for the most recent backups zip file, open it and look for the file that is being said is corrupted, in your case it's the InputBindings.xml. Copy this file and place it in your |launchbox\Data folder over writing the one that is there.
Do this with Launchbox not running, startup Launchbox and hopefully it doesn't give you the message. If it does give you the message go to the 2nd most recent backup zip file and copy that InputMapping.xml file out.