Quote:
Originally Posted by Bozzka
1 error
Add the missing OPF xml:lang attribute
The language must be specified (xml:lang in OPF package)
Learn more: Language
content.opf
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The code you posted looks fine.
What is giving the error? Is it CheckBook or epubCheck, or are you using another checker? Maybe something online?
Using the advice from @KevinH try adding this to the end of the <package> tag...
xml:lang="en"