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Metadata.db is ALWAYS in the root of the library folder (unless you jump thru hoop to locate it elsewhere.)
Run Library Maintenance (on the Library Icon in the GUI)
Common reasons for errors: 1)putting the Library on a network drive. 2)Multi-use (calibre is single access). 3)Using the OS (or 3rd party app) to make changes. Must use only Calibre GUI or command line utilities to keep pieces together
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