This just cropped up this afternoon for me before I updated Calibre but still exists after I updated. Not sure what this warning message is telling me or what to do next. It occurs when accessing a OneClick library.
Starting job: Search for books by 1 author
Overdrive Link 2.25.0, calibre 3.19.0
Search language: English
Search formats: Adobe EPUB eBook, Kindle Book, Mobipocket eBook, Open EPUB eBook
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Finding library books by Edward Abbey
Accessing library Pima OC
Get
http://pimacoaz.rbdigital.com
Get
http://api.rbdigital.com/v1/web/conf...b-e5bd9cd578d4
Search Pima OC for progress by edward abbey
Get
http://api.rbdigital.com/v1/search?s...&sort-by=title
Search Pima OC for progress by edward abbey:acceptMediaType basic
Page 1 of 0
Found 0 books in 1.2 sec
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Matching 1 calibre book with 0 library books
Found 0 matching calibre books in 0.0 sec