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Maverynthia,
Theducks simply offered an alternate way to try and find cover images. You will find that their are generally a couple of ways in calibre to complete any task. "Search the Internet" is the name of a plugin, while Google Images is one of the optional searches the plugin can perform.
Anyway, since you're still encountering the problem, why not try a smallish bunch of books and if you get an error, try again for each book individually? You can find which books need a cover by performing a cover:false search, then highlight some books and perform your standard metadata download. If any of the books fail, then go through those books one by one, to find the problem book (one of those without a cover) by repeating the search individually.
(Just so you know, you might find that some of those dozen books are missing. If some of the book cover's are found, those books can be removed by calibre because the search criteria no longer applies. That is, covers were found for those books so cover:false no longer applies.)
Once you've found one of the problem books, let us know the name of it and where you got the ebook file from (if you remember).
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