ERROR(RSC-005): Error while parsing file 'attribute "epub:type" not allowed here;
ERROR(RSC-005): Error while parsing file 'element "aside" not allowed anywhere;
How can I remove them? I want to use pop-up footnotes with epub3.
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epub:type attributes can only be used in epub3 books. You'll need to select Polish books > Upgrade book internals to convert your epub2 book to an epub3 book.