Backup software can often temporarily lock your library metadata.db while it is reading it to back up. That happens a few times a week to me due to my NAS WDCloud automatic backup software called WDSmart that is set to run a back up at the top of each hour. I just ignore the error and try again. Ignore and X out of any Calibre message that offers to create a new library due to the corruption. X out; do not answer by clicking any pushbutton or you may regret it "fixing" a non-problem. That is a dangerous dialog if you truly have no corruption.
DaltonST
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