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Invalid font-weight is just what it says: someone did not use one of the values permitted: You need to find where (usually the CSS)
Believe me, running the GUI and the Book Editors DEBUG section, will list WHERE (could be multiples) and jump you there with a click, in most cases.
libPNG has to do with Graphics (PNG code ? error)
Dictionary Key ?? parcing error
You will be surprised how many books from major outlets have (stupid) errors, some made by folk who code Web Pages, but those codes are not allowed in EPUB
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