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That css error can probably be safely ignored. But if you're using the Sigil tool to validate your css, though, you can double-check by setting the default css level to 3.0 for epub2s in the general Sigil preferences and check again.
If you have fontforge, or some other font editing software, you can also check the OS/2 version property of the font. If it's not version 3 or lower, it probably won't work right with ADE.
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