Delete the books folder (i.e. the folder that used to contain/contains metadata.db) THe delete the folder named calibre that contains global.py (you might have to do a search on your computer for global.py). Then run calibre. It should start trying to migrate the database again. Wath the progress dialog and note what book it stops at. Once you have the book name, I will tell you how to remove that book from the old database and redo the migration
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