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The one that's relevant to you is most likely the first one:
Your calibre library folder changed its location. This can happen if it was on an external disk and the drive letter for that disk changed. Or if you accidentally moved the folder. In this case, calibre cannot find its library and so starts up with an empty library instead. To remedy this, do a right-click on the calibre icon in the calibre toolbar (it will say 0 books underneath it) and select Switch/create library. Click the little blue icon to select the new location of your calibre library and click OK.
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