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In the daisy/ace epub-utils/epub-parser.js it only extracts epub3 style meta tags (those using the "property" attribute) and dc: tags, but has no code to extract a epub2 style meta tag with name and content attributes.
Thus you get that false error message. You can choose to ignore that false error but if you truly care about accessibility then opting for an epub3 is probably your best path forward.
That said a bug report against daisy-ace to support epub2 metadata meta tags in epub2 OPF couldn't hurt.
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