Quote:
Originally Posted by yotsman
calibre, version 0.7.43
ERROR: Cannot view: The Wailing Asteroid has no available formats.
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This error means the book entry has no file in the directory that calibre's database expects to find the book. Did you recently rearrange folders on your hard drive? If you select a book and open the containing folder (O) what files do you see?
If you deleted books you might want to check the recycle or trash bin.
Of course you can always restore from backup.