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@Tarana - that sounds like your entire configuration folder was 'disappeared' (deleted or moved), I have no idea how. Do you use any third party install/uninstall tools?
Have you looked in the recycle bin/trash can?
Look across your file system for files named 'dynamic.pickle', if you can find more than one then maybe one of them is within the old, now moved, calibre configuration folder.
BR
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