Looks like you have a corrupt ebook entry. And no it isn't the book you see in the log, it is the one"after" that. See in the error message where it says "ERROR parsing book: None"? That "None" is where it should be displaying the path to the ebook.
I think you need to run the library maintenance. I believe you have deleted the epub out of calibre's file system rather than using "remove format", so calibre thinks you have an epub but you don't for that particular book.
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