The error indicates that the size of the compressed file used to store the cover thumbnails would be too large to fit in a 32-bit space. That's a *very* large catalog. Performance would be slow to sluggish, if you could load it at all.
How many books are you trying to catalog?
You can try reducing the size of the thumbnails, eliminating the thumbnails, or (more sensibly) go back to building smaller catalogs of sections of your collection.
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