Description
The required Book ID parameter is not defined for your ePub eBook. The Book ID is used to identify your eBook and to avoid confusion with other existing eBooks.
Solution
Specify the Book ID parameter in your ePub eBook settings:
1.On the Project tab, in the Project group, click Project Options.
2.In the left sidebar, click ePub eBook.
3.In the Book ID box, enter a unique Book ID.
4.Click OK.
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