Why it matters
Markup only earns stars, prices, FAQs or breadcrumbs in search results when it carries the properties Google requires for that type: an Article needs a headline, an image and a publication date; a Product needs an offer with a price and currency, a review or a rating. Markup that is present but incomplete earns nothing.
How to fix it
Add the missing properties listed, then confirm the page in Google's Rich Results Test.