Seems that the creator of this thread didn't have answer for his/her problem and I didn't find any other threads from the whole forums with this topic.
When I run my epub file through the epubchecker, I get this warning:
ERROR: book.epub/OEBPS/content.opf(9): unfinished element
I checked every element in opf file and every one of them is closed. I also compared with other epub books (e.g. Project Gutenberg) and didn't find any significant difference. I exported this e-book from InDesign book file. What could be the problem? My ebook works perfectly in Digital Editions and Sony PRS-505 but I'm still curious to know what causes the error.
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