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kovidgoyal · 07-15-2019, 10:08 PM

This happens if you upgrade for a fairly old calibre directly to 3.45.2 skipping the upgrades in between. It will be fixed in the next calibre release.

Downgrade to calibre 3.44 remove the .json files, restore the .py files. 3.44 will correctly migrate the preferences files. Then upgrade to 3.45.2 and you should be fine.

07-15-2019, 10:08 PM	#14
kovidgoyal creator of calibre Posts: 45,389 Karma: 27756918 Join Date: Oct 2006 Location: Mumbai, India Device: Various	This happens if you upgrade for a fairly old calibre directly to 3.45.2 skipping the upgrades in between. It will be fixed in the next calibre release. Downgrade to calibre 3.44 remove the .json files, restore the .py files. 3.44 will correctly migrate the preferences files. Then upgrade to 3.45.2 and you should be fine.