Comment 2 for bug 1310967

First, the Kobo Utilities plugin isn't giving you an error message at all. It's the KoboTouchExtended plugin, for which fortunately you've reported a bug in the right place.

Second, there's a lot of information you're missing that you were asked for when submitting this bug. Please read http://www.mobileread.com/forums/showthread.php?t=211135 and provide the rest of the information I've asked for, remembering to set the bug to Private unless you're certain the book you provide meets "Life + 70" copyright requirements.