EPUB error

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When validating the epub version of a manuscript, I get an error which says: content.opf, line 1, position 373, Language element is empty. I do not know what this error refers to and therefore cannot fix it. Can someone please explain it to me?

The dc:language element has to define a language code that expresses the language of your publication; it can't be included as an empty tag. You'll need to find the offending empty element in the content.opf file and correct. See the EPUB 3 dc:language element description for more information (there's no difference if this is an EPUB 2 file).

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