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					Originally Posted by judsal  Thank you guys for the help. I'm not sure how the folder got renamed but I think it has something to do with PCloud. I was using a PCloud folder before and it seems like that library was somehow still in my Calibre although I thought I had deleted it.
 
 I changed the name and deleted the PCloud library and everything seems to be working.
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 I had the same problem a couple of days ago with PCloud.  I don't sync, but moved a small library to PCloud. [I keep a small library of new additions called "move to pcloud" and move that to PCloud periodically, after which I delete the books in it.] Anyway, after I moved it, Calibre gave me the same error.  I deleted the small library on my Mac, added a new empty one through Calibre and moved on.  Thank you so much for your question, now I know it is a PCloud problem.  Thank goodness I didn't move my entire library!