The invalid-aria-prop warning will fire if you attempt to render a DOM element with an aria-* prop that does not exist in the Web Accessibility Initiative (WAI) Accessible Rich Internet Application (ARIA) specification.
If you feel that you are using a valid prop, check the spelling carefully.
aria-activedescendantare often misspelled.
React does not yet recognize the attribute you specified. This will likely be fixed in a future version of React. However, React currently strips all unknown attributes, so specifying them in your React app will not cause them to be rendered