Try to validate with Flightcrew, the messages will probably be more informative.
I guess the problem is you cannot have content in a list (<ul>) that's not inside an item (<li>), so try adding <li>...</li> around the <ol>...</ol>.
Anyway, I think the formatting options for lists are very poor, so I don't use them, and prefer normal paragraphs with hardcoded numbers if needed.
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