I rewrote the configuration of the KoboTouch driver. This was released in calibre 2.60. Unfortunately, I made a mistake in the configuration migration. But, it only happens if the configuration hasn't been changed for about three years. I have fixed this and it will be in the next calibre release. To get past this now, open the calibre configuration directory and delete the file "device_drivers_KOBOTOUCH.py". This will revert the driver configuration to the defaults and it will work again. After that, I recommend opening the KoboTouch driver configuration, making any changes and saving them.
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